Thanks for letting us know about this, but for the life of me I don't know what do on Github. I kinda know it's a "forum" for programmers to work together on open source programs, but I can't figure out how to get a Windows executable from it. Any guidance you can offer would be greatly appreciated.

ok it basically goes like this:
1) github is a site where developers can create and collaborate on a project
2) each project has its own homepage on github
3) from this homepage you can check what changes are being made to the source code
4) after every change, github compiles the source code into a downloadable package (this is true only for projects that have been configured to take advantage of this feature)
5) from time to time, when developers are confident that all changes have been tested, a package might be declared as an official release


for the Perimeter Open Source project, the homepage is this
https://github.com/KD-lab-Open-Source/Perimeter

for this project there are no official releases, yet
https://github.com/KD-lab-Open-Source/Perimeter/releases

changes are tracked here
https://github.com/KD-lab-Open-Source/Perimeter/commits/cmake

ready-to-use unofficial releases (usually known as nightly builds) are available here
https://github.com/KD-lab-Open-Source/Perimeter/actions?query=branch%3Acmake

there you can choose what kind of package to download (using the "Workflows" section on the left)
after you have done so, the list on the right will update, showing only the results that match your criteria
https://github.com/KD-lab-Open-Source/Perimeter/actions/workflows/windows_msys_build.yml?query=branch%3Acmake

by clicking on the most recent "workflow run result" you'll access a page detailing the outcome of the "compilation+packaging process"
https://github.com/KD-lab-Open-Source/Perimeter/actions/runs/1751861919

scrolling down, you'll find the available downloads listed under the "artifacts" section of the page
"debug builds" are usually targeted to developers or people that are helping with testing the project
"release builds" are intended for end-users



when you have a "O.S. Perimeter unofficial build" on your hand, you can simply unzip the package contents into your game installation folder (overwriting existing files, when asked)
a new executable will replace the one provided by gog: you can use that to launch the game

Amazing! But there are no binaries as far as I can see?!