Any way to downgrade/rollback to Rundown #3 or previous versions?

Some friends and I purchased GTFO with the intention of using the VR mod. However this isn't compatiable with Rundown 4 due to code changes.

Is there anyway to rollback or obtain a previous version of the game specifcally Rundown #3? Even if it only works for singleplayer.

Not interested in discussion/debate of how playing previous rundowns is not intended, Cheers.