Related:

Download installer (stable version)

The installers on this page are stable versions, with even numbers after the dot. These versions have been tested thoroughly. The installers are very easy to use under Windows with these three steps: (1) close any open Gekko’s, (2) uninstall Gekko, and (3) download and install InstallerForGekko.msi . In step (3), you may have to skip a Windows warning, read more under troubleshooting. Mac/Linux users, see here.

The 3.2 version is stable, but for the latest features, do not hesitate to consider the 3.3.x versions from the development versions page (cf. the Gekko versions overview page). Regarding installation of the Gekcel add-in for Excel, read more here. Regarding installation of the PyGekko package for Python, read more here.

 

  • Stable version 3.2 (patch #2) — 12/11 2025. First release of 3.2 was on 10/8 2025.
  • All the versions in the 3.2 series are considered stable, i.e. the patches do not alter critical code (the full version number is 3.2.2).
  • Gekko: installer 32-bit or 64-bit. [signature]. Please close Gekko before installation!
  • Gekko: setup 32-bit or 64-bit. [signature]. Only if you have problems with the installer file.
  • Gekko: zip-file 32-bit or 64-bit. [signature]. For manual installation — experts only!
  • Gekcel: zip-file 32-bit or 64-bit. [signature]. Excel add-in. Gekcel is a self-contained product bundle, containing all necessary Gekko files inside. Therefore, Gekcel runs completely independently of Gekko (and vice versa), and the version number and bitness of Gekko vs. Gekcel installations may differ.
  • PyGekko: see here or here (Gekko package for Python, only available for versions 3.3.x).
  • Bitness: 32- vs. 64-bit. System requirements: Both Gekko and Gekcel require Microsoft .NET Framework 4.6.1 or later. Gekcel requires Microsoft Excel 2007 or later, too. In general, using Gekko 64-bit is recommended if possible.
  • Change-log (detailed list of changes).
  • An extremely minor patch (relative to 3.2.1). Related to the alphabetical ordering of series names in .csv/.prn/.xlsx files, when exporting.
  • Stable version 3.2 (patch #1) — 10/8 2025. First release of 3.2 was on 10/8 2025.
  • All the versions in the 3.2 series are considered stable, i.e. the patches do not alter critical code (the full version number is 3.2.1).
  • Gekko: installer 32-bit or 64-bit. [signature]. Please close Gekko before installation!
  • Gekko: setup 32-bit or 64-bit. [signature]. Only if you have problems with the installer file.
  • Gekko: zip-file 32-bit or 64-bit. [signature]. For manual installation — experts only!
  • Gekcel: zip-file 32-bit or 64-bit. [signature]. Excel add-in. Gekcel is a self-contained product bundle, containing all necessary Gekko files inside. Therefore, Gekcel runs completely independently of Gekko (and vice versa), and the version number and bitness of Gekko vs. Gekcel installations may differ.
  • PyGekko: see here or here (Gekko package for Python, only available for versions 3.3.x).
  • Bitness: 32- vs. 64-bit. System requirements: Both Gekko and Gekcel require Microsoft .NET Framework 4.6.1 or later. Gekcel requires Microsoft Excel 2007 or later, too. In general, using Gekko 64-bit is recommended if possible.
  • Change-log (detailed list of changes).
  • Stable version, with updated help files. Regarding what is new in Gekko 3.2, please consult the online help file.
  • Stable version 3.0 (patch #9) — 12/12 2019. First release of 3.0 was on 26/4 2019.
  • All the versions in the 3.0 series are considered stable, i.e. the patches do not alter critical code (the full version number is 3.0.9).
  • Installer file (please close Gekko before installation!) [signature]
  • Setup file (only relevant if you have problems with the installer file) [signature]
  • Zip-file (for manual installation — experts only!) [signature]
  • Change-log (detailed list of changes)
  • Stable version, with updated help files. Regarding what is new in Gekko 3.0, please consult the online help file.
  • 3.0.9: (12/12 2019): Patch #9. [install]  [zip]  [signature]. Fix regarding DOWNLOAD connection.
  • 3.0.8: (5/12 2019): Patch #8. [install]  [zip]  [signature]. Small bugfixes, including user manual.
  • 3.0.7: (26/11 2019): Patch #7. [install]  [zip]  [signature]. PLOT labels fix, futureproofing regarding 3.1.x versions. See change-log.
  • 3.0.6: (30/10 2019): Patch #6. [install]  [zip]  [signature]. Procedures and functions with default parameters and prompting. Import cells from Excel into nested list or map. Matrix-like operations on nested lists. OLS dump of FRML equations. Mute option. And more, see change-log.
  • 3.0.5: (16/9 2019): Patch #5. [install]  [zip]  [signature]. Handles Excel-dates, some new functions, bugfixes. See change-log.
  • 3.0.4: (2/9 2019): Patch #4. [install]  [zip]  [signature]. Bugfix version, see change-log.
  • 3.0.3: (27/8 2019): Patch #3. [install]  [zip]  [signature]. See change-log, there are quite a few changes and some bugfixes. Ini-file logic changed, new <l> and <dl> operators,  <missing = ignore> option, x[#i] possible in naked lists, export of matrices to Excel.
  • 3.0.2: (7/6 2019): Patch #2. [install]  [zip]  [signature]. Some minor enhancements (see change-log), and a bugfix regarding the combination of multipliers and the sum() function, for instance PRT <m> sum(#i, x[#k]).
  • 3.0.1 (26/4 2019): First version. [install]  [zip]  [signature]
  • Stable version 2.4 (patch #2) — 12/12 2019. First version released on 26/11 2019.
  • All the versions in the 2.4 series are considered stable, i.e. the patches do not alter critical code (the full version number is 2.4.2). Existing 2.4 users should consider migrating to 3.2 or 3.3.x where new features are implemented (there are translators for this).
  • Installer file (please close Gekko before installation!) [signature]
  • Setup file (only relevant if you have problems with the installer file) [signature]
  • Zip-file (for manual installation — experts only!) [signature]
  • Change-log (detailed list of changes)
  • Stable version, with updated help files.
  • 2.4.2: Fix regarding DOWNLOAD connection. [install]  [zip]  [signature]
  • 2.4.1: Builds upon 2.3.12, can read 3.0 or 3.1.x databanks, see more in the change-log. [install]  [zip]  [signature]
  • Stable version 2.2 (patch #6) — 29/4 2017
  • All the versions in the 2.2 series are considered stable, i.e. the patches do not alter critical code (the full version number is 2.2.6). Existing 2.2 users should consider migrating to 3.2 or 3.3.x where new features are implemented (there are translators for this).
  • Installer file (please close Gekko before installation!) [signature]
  • Setup file (only relevant if you have problems with the installer file) [signature]
  • Zip-file (for manual installation — experts only!) [signature]
  • Change-log (detailed list of changes)
  • Stable version, with updated help files.
  • 2.2.6: Small J-factor fix. [install]  [zip]  [signature]
  • 2.2.5: Some PLOT improvements.  [signature]
  • 2.2.4: Some PLOT improvements. [signature]
  • 2.2.3: Some minor fixes. [signature]
  • 2.2.2: Some minor fixes. [signature]
  • 2.2.1: First version.
  • Stable version 2.0 (patch #3) — 2/3 2016
  • All the versions in the 2.0 series are considered stable, i.e. the patches do not alter critical code (the full version number is 2.0.3).
  • Installer file (please close Gekko before installation!)
  • Setup file (only relevant if you have problems with the installer file)
  • Zip-file (for manual installation — experts only!)
  • Change-log (detailed list of changes)
  • Stable version, with updated help files. Regarding what is new in Gekko 2.0, please consult the online help file (particularly here).
  • 2.0.3: Some smaller bugfixes + update of help-file index/keywords.
  • 2.0.2: Some bugfixes related to PRT/MULPRT.
  • 2.0.1: First version.
  • Stable version 1.8 — 22/10 2013
  • All the versions in the 1.8 series are considered stable, i.e. the patches do not alter critical code (the full version number is 1.8.1).
  • Installer file (please close Gekko before installation!)
  • Setup file (only relevant if you have problems with the installer file)
  • Zip-file (for manual installation — experts only!)
  • Change-log (detailed list of changes)
  • Stable version, with updated help files.
  • Stable version 1.6 (patch #8) — 2/5 2013
  • All the versions in the 1.6 series are considered stable, i.e. the patches do not alter critical code (the full version number is 1.6.8).
  • Known BUGS in version 1.6.7 (fixed in 1.6.8)
  • Installer file (please close Gekko before installation!)
  • Setup file (only relevant if you have problems with the installer file)
  • Zip-file (for manual installation — experts only!)
  • Change-log (detailed list of changes)
  • Stable version, with updated help files.
  • 1.6.1: First version.
  • 1.6.2: Minor bugfixes.
  • 1.6.3: Minor fixes related to menus.
  • 1.6.4: Minor fixes related to menus.
  • 1.6.5: Minor fixes (table folders).
  • 1.6.6: Minor bugfixes.
  • 1.6.7: Bugfix related to failsafe mode.
  • 1.6.8: Bugfixes, primarily RETURN command.
  • Stable version 1.4 (patch #9) — 5/2 2012
  • All the versions in the 1.4 series are considered stable, i.e. the patches do not alter critical code (the full version number is 1.4.9).
  • Installer file (please close Gekko before installation!)
  • Setup file (only relevant if you have problems with the installer file)
  • Zip-file (for manual installation — experts only!)
  • Stable version, with updated help files.
  • Patches:
  • 1.4.1: Fixes an issue when combining Newton and Gauss in fail-safe mode.
  • 1.4.2: Makes PPLOT and UDVALG windows truly independent/floating.
  • 1.4.3: Fixes error message line numbers + some minor problems.
  • 1.4.4: Adds error dialog, and commands PAUSE, STOP and EXIT.
  • 1.4.5: Has “CLEAR *”, CLOSEBANKS, and some minor fixes.
  • 1.4.6: Minor sound option changes.
  • 1.4.7: Gauss convergence, ITERSHOW and CHECKOFF commands.
  • 1.4.8: Added option “reorder” for the Gauss solver.
  • 1.4.9: Checks for problems using ‘()’ together with ‘;’ in same line.
  • Stable version 1.2 — 14/6 2011
  • Installer file (please close Gekko before installation!)
  • Setup file (only relevant if you have problems with the installer file)
  • Mostly minor changes on top of version 1.0.53. The help files have been updated. This is a stable version, for use on the ADAM workshop Thursday/Friday 16/6 and 17/6 2011 (the full version number is 1.2.0). In the future, versions with an even digit after the first “.” will indicate stable versions.