[Jaws2002]

I tried many ways to do this for the same reasons you mentioned. Much more natural lighting, better visuals.
I even contacted steam about it. It won't work. Steam won't let you play until you download the update.

I managed to restore one of the old backups I had. I keep playing with it from time to time. It's a pain to go back and forth between versions all the time, but with the Steam folder and the backup, being on SSDs it works pretty fast.

This are some shots taken with that instal (most likely messed up by the upload messy conversion):