To install:
Either subscribe here:
http://steamcommunity.com/sharedfiles/filedetails/?id=1244163099
Or, to install any version:
- Prepare a .gro, normally just by downloading a prerelase. You can also download the repo and run export.py (if python's installed)
- In game go to extras -> workshop packages and disable randomizer, or just unsubscribe on the workshop
- Navigate to [main talos install]\Content\Talos
- Move the .gro there
- Restart the game
- Check that the version number on the back of the terminal is what you expect it to be
To uninstall just re-enable/re-subscribe to the normal version, though eventually you should also delete the .gro