The "bug" is 100% on your end.
There are 25+ servers on GES v4.1, if you cannot find a single one it's either your filter settings, a corrupted installer or other installation issues.
Make sure the installation path is .../Steam/SteamApps/Sourcemods/ and also the mods folder name is gesource.
If you renamed it for some reason, you won't find servers.
Also by "other Games", KM surely was talking about other mods, not retail Games.
Installing an older version is not a good idea.
Even if you see the servers you won't be able to join them because of different .dll files and maps.