Access to 3.x versions of the game through Steam betas

Hi,

I'm trying to run Galactic Civilizations III in Proton but it doesn't work (display freezes when clicking on ships).  Apparently earlier versions before 3.9 worked fine so I'd like to try that.

In Steam, one can select a few old versions from the beta version menu; one from the 4.x series and a couple from the 2.x series.  However, I'd like to try a version from the 3.x series, before 3.9.  Is that possible?

Thanks,

someg33zer