Solver Add In, free solver add in software downloads. With Add-in Express 2007 for Delphi you can create deployable, updatable, secure and isolated, version-neutral feature-rich plug-ins for all available Microsoft Office versions, including Office 2007, 2003, 2002 (XP) and Office 2000. Download Microsoft Office Solver Add In: Click here to download: Excel Solver Add-In. Go to your download folder or the directory on your computer where you downloaded the file above. Unzip the zipped folder by right clicking on it and clicking on “extract file” take note of the directory and the extracted file’s name. Installation of.

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SolverStudio runs as an Excel add-in file for Excel 2007-2013. (The tools we use mean that Excel 2003 is not supported.) The download includes all the required components, including IronPython, PuLP, standard Python (CPython), the GNU Linear Programming Kit (GLPK), and AMPL and GAMs support files. SolverStudio has been beta tested under Windows Vista, Windows 7 and Windows 10 using Excel 2007, 2010, 2013, 2016 & 2019. Note that Excel 2013 requires releases 0.06.00.00 and later to work correctly.

Like many add-ins, SolverStudio will not work with some versions of Office 365 installed from the Windows Store; see this OpenSolver page for more info.

If you download this software, please leave a comment describing your experience in installing and running it. We’d love to know if it worked properly on your computer, or if there are bugs we need to fix.

To install SolverStudio:

A/ Install as an end user, not as an Administrator The standard Microsoft installer used by SolverStudio and other Excel add-ins installs for the current user only (i.e. into the current “profile”); it will not make SolverStudio available for other users and typically does not need Administrator privileges. Hence, SolverStudio should always be installed while logged on using your normal account. (See below for a more complicated all-users installation process most users will not need.) Depending on your machine, running SolverStudio’s “setup.exe” may try to install the .NET 4 and the Office support files if you do not already have these files already installed; this will probably require Administrator priviliges. You should not need administrator privileges to install SolverStudio itself if you already have these required system files. If you need to logon (or “Run As”) as an Administrator to complete the installation, be sure to run setup.exe again using your standard non-admin logon after completing the Administrator install.

B/ Uninstall Any Earlier Version To be safe, uninstall any earlier version of SolverStudio using the Control Panel’s Add/Remove programs, the Uninstall button under SolverStudio’s About menu, or the SolverStudio/SolverStudio/Uninstaller.exe file. (The latter two uninstall options now handle more cases than the Control Panel, including advanced all-user installations.)

C/ Download SolverStudio Zip File.
We recommend you download our latest release (announced on 20150813, and updated on 20150903 to include new MOSEK examples and again on 20151117 to fix an IronPython bug and again on 20160408 to fix issues with the latest Julia/JuMP release and again on 20160520 with CMPL, NEOS & GMPL improvements).

SolverStudio_00_09_03_00 20160520.zip (57886 downloads) 23 MB

If you hit download problems, an earlier version is available to be downloaded in smaller parts.

Download Excel Solver Add In For 2003, 2007 and 2010. I already provided the link to download the zipped toolpak add-in folder in the article with directions on. In Excel for Windows, if you don't see the Solver command or the Analysis group on the Data tab, you need to load the Solver add-in. Click the File tab, click Options, and then click the Add-ins category. 2) Select the Add-Ins Tab in the left Window Pane. 3) Choose “Excel Add-ins” in the Manage Section. 4) Click on the “Go” button. 5) A New Window will appear that will display the Add-Ins that are available for Excel. 6) Choose the desired Add-In, i.e. 7) Now, you will be able to download the Add-In.

An older version, SolverStudio 0.5.4 (2013.06.25) is also available from our downloads archive, and does not require the full .Net 4 needed by later versions (as detailed below). Fios tv app for mac.

D/ Unblock Zip File. Right click on the downloaded.zip file, choose Properties, and click the Unblock button if there is one; see the image below. (You cannot install from files that have been ‘blocked‘ by Windows; see also here.)

E/ Extract Files. Extract the SolverStudio files from the .zip file to a convenient location; the files in this location are used whenever SolverStudio runs. (You can normally run SolverStudio from any location. In our labs running 64 bit Windows 7 with 32 bit Office 2010, we simply make SolverStudio available on a network drive. However, if you are installing for all users (see below), or you are an administrator setting up the machine for other less-privileged users to install themselves later, then copying the files into either Program Files if you are using 64 bit Office or a 32 bit Windows, or into Program Files (x86) if you are using 32 bit Office on a 64 bit Windows, may be safest as these are fully trusted locations.)

Then, select the Solver Add-in check box in the Add-Ins dialog box to put a check mark in it before you click OK to close the dialog box and reload the add-in. About the Book Author Greg Harvey, PhD, is President of Mind Over Media and a highly skilled instructor. The Analysis ToolPak is one of Excel’s most beloved ‘Application Add-ins’. And for a good reason! This add-in, with its financial, statistical, and engineering data analysis tools, can save you a great deal of time.

F/ Quit all copies of Excel.

G/ Run Setup.exe. Double click on the Setup.exe file, giving permission to install when requested. (If this fails, try clicking directly on SolverStudio.vsto, which will skip some of the installation steps, but may still work. Also see “Installation Errors” below.) Do not run as Administrator, but while logged in as the final end user, as installation is only for the current user. (If needed, see All-User installation notes below.)

Running Setup.exe will install any support files you need, as follows.

From version 0.6.0 onwards, SolverStudio uses the full .Net Framework 4.0. (Earlier versions used the “.Net Framework v4 Client Profile”, which is already installed on most machines.) SolverStudio also uses “Microsoft Visual Studio 2010 Tools (VSTO) for Office Runtime” which supports Office 2010 and later versions. (This VSTO link should always point at the latest version of this “VSTO 2010” file.) Running Setup.exe should install these automatically (but see below for possible errors).

H/ Launch Excel. The SolverStudio commands should then appear under Excel’s Data tab.

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I/ Sept 2018 Excel Update: Turn on “Optimize for Compatibility” The Sept 2018 update to Excel made changes that broke a number of Excel add-ins. These changes may give you a greyed-out SolverStudio editor window, or an editor window showing at a strange location. A workaround is documented at https://www.add-in-express.com/creating-addins-blog/2018/09/24/panes-problems-solved/ :
“A workaround is to choose the Optimize for compatibility option in Display Settings; see the status bar or File Options General. Select this option, restart the Office application and it will use the old Windows API.”
Thanks to Eldemar for confirming this works.

Disabled Add-in Problems: If SolverStudio does not show up in Excel, it may be “disabled” by Excel. This can happen if SolverStudio crashes, or something else goes wrong. Use Excel’s File… Options… Add-Ins…. Manage, and check to see if SolverStudio is in the “Disabled Application Add-ins” list. If it is, use COM Addins to enable SolverStudio.

Installation Error “The value of the property ‘type’ cannot be parsed”: Install VSTO Separately and/or use Run as Administrator
If you are behind a firewall or proxy server, or get an error such as “The value of the property ‘type’ cannot be parsed” the following comments from Ted Ralphs might be helpful. Installing SolverStudio from behind a proxy servers can be a bit problematic. We spent a lot of time trying to figure out how to do it and it turned out the problem was that the installer tries to fetch another installer (for Visual Studio 2010 Tools for Office (VSTO) Runtime) from the Microsoft Web site that is a pre-requisite. This can sometimes fail without giving any helpful error message. To get around it, we finally figured out that you can just follow these install instructions to download this “Visual Studio 2010 Tools for Office (VSTO) Runtime” installer and install those tools separately.

This error can sometimes also be fixed by installing as Administrator. That is, right-click “setup.exe” and choose “Run as Admininstrator”.

There is a good description of a variant of this error at the DataEverywhere VSTO Add-in help pages.

Installation Error “A runtime error occurred during the loading of the COM add-in“: Use Run As Administrator
If the above process for installing Visual Studio Tools for Office Runtime does not work, please try running as Adminstrator during the installation. That is, right-click “setup.exe” and choose “Run as Admininstrator”. We have had Excel report (under COM add-ins) that “A runtime error occurred during the loading of the COM Add-in.”; installing as Administrator fixed this.

Installation Error “The following Microsoft Office solution cannot be installed due to a general error“: Try installing parts separately
We have recently (Dec 2016) had reports (report 1, report 2) of “general errors”, eg “The following Microsoft Office solution cannot be installed due to a general error: SolverStudio.vsto. 0x80070002” (or error code 0x8007007E). We suggest you manually instal the full .Net Framework 4.0. and the “Microsoft Visual Studio 2010 Tools (VSTO) for Office Runtime”; you will almost certainly need to be logged in under an Administrator account.

All-user Installation: By default, SolverStudio is installed for the current user only (like all VSTO Office add-ins). Instructions are given under “SolverStudioSolverStudioAdvancedInstallers” on how to install SolverStudio for all users on a machine. (Many thanks to Daniel Frances from the University of Toronto for testing this in his labs.) It is important to copy the SolverStudio files into either Program Files or, if you are running a 32 bit Office on a 64 Windows, into Program Files (x86); putting them into the wrong program files folder will cause SolverStudio to fail.

Example Models: The download includes sample workbooks that show many of the features.

Uninstalling: SolverStudio can be removed by using the Windows Add/Remove Programs (or the equivalent under Vista/Windows 8), or using SolverStudio’s About… Uninstall button. Version 0.6.0 also includes an “Uninstaller.exe” file you can run. To uninstall an All-Users installation, we suggest using “Uninstaller.exe” and which typically needs to be “Run as administrator”. Advanced users may wish to explore the “AdvancedInstallers” for other uninstall options. After uninstalling, you can then delete the files you downloaded.

Upgrading SolverStudio When upgrading from a previous version, please uninstall SolverStudio first, and then install the new version.

We have come across an example where upgrading failed because of a glitch in Microsoft’s VSTO system used by SolverStudio. (Thanks, Ted, for helping us track this down.) When you install SolverStudio, it copies the files (including SolverStudio.dll) into a cache. Sometimes, the files in this cache are left open, and so the VSTO installer used by SolverStudio fails to update the files (without warning you). You then end up running an old copy of SolverStudio.dll, which typically gives errors when solving models etc. To fix this, please (1) restart Windows to close the SolverStudio.dll, (2) uninstall SolverStudio using the Control Panel or SolverStudio’s About… Uninstall button, (3) install SolverStudio again. Note that the location of the cached files is given in SolverStudio’s About box, so you can also try manually deleting this cached DLL (and the other files in the cached folder) to force Windows to update these when you next launch SolverStudio. On my machine the DLL location given in the SolverStudio’s About box is:

System.Reflection.Assembly.GetExecutingAssembly().Location:

C:Usersamas008AppDataLocalassemblydl3C5BH1QGV.QTQ4P3CWJ02.81Wc28f32d6689ff424_4f72ce01SolverStudio.DLL

Internet Access: We have been asked about SolverStudio’s internet access requirements.

AMPL on NEOS makes the following IP connection:
NEOS_HOST=”www.neos-server.org”
NEOS_PORT=3332

The AMPL student version installer menu accesses the AMPL site to do a download from http://www.ampl.com/NEW/TABLES/amplcml.zip; this is just a standard connection using Python’s urllib.urlretrieve().

The VSTO framework under which SolverStudio runs may do a check on the code signing certificate; I’m not sure what port this uses, but it has always worked fine in our testing. SolverStudio does not make any other internet connections apart from opening web pages.

SolverStudio has no affiliation with, nor is recommend by, Microsoft, AMPL, GAMS, GNU, or Frontline Systems. All trademark terms are the property of their respective owners.

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The Solver optimization add-in that ships with Excel is used extensively in our books. Solver is not a Microsoft product. It was developed by Frontline Systems, which has developed a number of Solver products, some much more powerful than the version of Solver that comes with Excel. (See solver.com for more information.)

We have no control over the idiosyncrasies of Solver – and there are some – but I’ll discuss Solver issues on this page as I hear of them.

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·Bug fix in Solver for Excel 2010 and later. There are certain models where Solver for Excel 2010 or later versions can give the wrong solution. The conditions are that (1) you are maximizing, (2) the starting solution is feasible, and (3) you have integer constraints. Frontline Systems has fixed the problem, and you can download the fix: For the 32-bit: Solver Fix 32-bit.zip, and 64-bit: Solver Fix 64-bit.zip. Each of these zips contains a single file called Solver32.dll, but the two Solver32.dll files aren’t the same. One is for 32-bit Excel and the other is for 64-bit Excel, so make sure you download the right one. Once you download the appropriate file, you should save its dll file to the appropriate folder on your hard drive, overwriting the previous dll. This folder will typically be something like C:Program FilesMicrosoft OfficeOfficexxLibrarySolver, although you might have to search for the dll on your PC.

·Model not linear. Do you occasionally get the annoying Solver message that the conditions for a linear model are not satisfied, when you know your model is linear? I do! Frontline Systems has suggested that this is typically due to a poorly-scaled model (some really small numbers mixed with some really large numbers). Here are three possible remedies.

oRescale the model manually. For example, if unit costs are shown as millions of dollars, as in 5,000,000, replace them with 5.

oUnder Solver Options, check the Use Automatic Scaling option. Solver will do its best to rescale appropriately, maybe successfully, maybe not.

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oUnder Solver Options, change the precision to a larger number (i.e., fewer zeros, such as 0.00001 instead of 0.000001). Essentially, this relaxes Solver's criterion for what is linear and what isn't (see next bullet), so that truly linear models will more likely be recognized as such.

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·Test for linearity. The previous bullet indicates what to do if you’re sure your model is linear but Solver claims otherwise. But how does Solver make its check for linearity in the first place? Here’s the idea. Let’s say your function, written algebraically, is f(x,y) = 4x+6y, where x and y are decision variables. This is exactly what we mean by a linear function: a sum of products of constants and decision variables. To check that this function is linear, Solver approximates the derivatives of the function numerically at various points. For example, the approximate derivative with respect to x at the point (x,y) is [f(x+dx,y)-f(x,y)]/dx, for some small value dx. For our function, this is [(4(x+dx) + 6y) – (4x+6y)]/dx = 4dx/dx = 4. This answer should clearly be 4 regardless of the values of x and y. If it is “sufficiently close” to 4 for a number of points (x,y), i.e., if the derivative is practically constant from point to point, then Solver concludes that the function is linear. However, numerical computer error can make this value slightly different from 4, and this error is typically larger when a model is poorly scaled (some really small numbers mixed with some really large numbers). If the error is large enough, i.e., if the derivatives don’t seem to be constant from point to point, Solver reports that the model isn’t linear.

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·Using Solver with VBA: You can invoke Solver's functionality with a VBA macro. In fact, I did this in a number of the applications in my VBA for Modelers book. To do this, you must first set a 'reference' to the Solver.xlam file (or the Solver.xla file for old versions of Excel) in the VB editor. However, depending on how Solver is setup on your computer, when you run one of these applications, you might get a message about 'Missing Solver reference' or some such thing. This has been a recurring problem with users, so I finally asked my contact at Frontline Systems for a fix. Here is his response: When a workbook has a reference to an add-in, Excel will store this reference with its entire path. Now, when a workbook gets opened in Excel, and it has a reference to an add-in, which has not been opened yet, Excel will try to open the add-in, from the path that was stored in the reference. If this is not successful (for example, the workbook was saved on another machine with a different file location) Excel will add the 'Missing: solver.xlam' reference. To fix this, you would have to open solver.xlam (or solver.xla) by invoking Solver from Excel, before opening your workbook. Then open your workbook and save the workbook.

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Send e-mail to albright@indiana.edu

Albright and Winston are both retired from the Kelley School of Business, Indiana University, Bloomington.

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Updated: 3/14/2016