Gekko 2.0
Gekko 2.0 marks a major upgrade of the capabilities of the software. The syntax has been modernized, and the underlying parser has been streamlined. There are many new capabilities regarding timeseries, lists, matrices, scalars, databank handling etc. Solving models with leads has also been improved. See here: http://www.t-t.dk/gekko or here: http://www.t-t.dk/gekko/doc/user-manual/index.html?i_new_features.htm regarding the new features.
InstallerForGekko.msi is a standard Windows installer. If the installer poses problems, try setup.exe together with the installer. Alternatively, you can manually unpack Gekko.zip into a new folder, and start gekko.exe from there.
Regarding C# source code and Visual Studio, see the README file (not README.md). Documentation regarding the source code is here: http://www.t-t.dk/gekko/source_code_documentation.html. Gekko is new on GitHub, but this is where future versioning and development will take place!