Re: Sims 3 CAW tool says The Sims 3 isn't installed

@stxeep  The issue is that the registry entries for the Steam version of Sims 3 have the word (Steam) in them, so CAW doesn't recognize those entries.  If you're comfortable editing your computer's registry on your own, you can fix this yourself.

https://steamcommunity.com/sharedfiles/filedetails/?id=277022926

Please be very careful though, and back up the registry before doing anything else.  Removing or altering the wrong file can prevent your computer from working correctly.