You can choose between several version of FFSM++. The “Stable Version” in SourceForge has been manually picked up and it should at least compile. It's the recommended way to try FFSM++.
The latest version is an automatic snapshot derived directly from git but it may occasionally be in a development status where it doesn't even compile.
The pre-compiled windows versions on the other hand are not recommended, even if they represent the easiest way to install FFSM++ on a Windows environment (just click the setup.exe file), as they are usually very old (we don't use Windows to develop FFSM++, but time to time we create windows compiled versions. If you need a windows version of FFSM++ and you can't compile it by yourself, just ask us and we will be glad to make a new Windows built).
(note: these files are ready to be used but they could also be VERY old !)