I wanted to use some older mods, which no longer work and was wondering if you could get an older version, and if it would run seperate from the latest version?
The only thing you can do (that being officially supported) would be getting the 0.4.0.9 DX9 version from steam via the betas tab. It's a fallback version for people that don't have the hardware/OS to run DX11, but may work for this too.