Re: Why can't I play the sims 4 with it installed?

The only way to ISOLATE which Mod it is is for you to remove them one at a time and test the game after each one is removed.  If that sounds to tedious and time consuming that's because it is if you have too many mods.  What I would personally do is remove them all and confirm that the problem goes away.  Then I would decide on which mods were my absolute favorites and then go hunt them down and download the latest versions of them.  I wouldn't replace my favorite files by just putting them back because you could be overlooking out-of-date mods.  I don't know if you organize your mods into folders by type and category and such, but this is a good reason to do that going forward.  It will make it easier for you to section of chunks of it for troubleshooting and analysis and such.