Sims 4 crashes immediately after launching

K1w1x1​  I've split your posts into their own thread in PC tech since this sounds very much like a tech issue.  Out of curiosity, was this as simple as doing a proper restart of your computer?

If this happens again, try playing with your computer offline.  You can sign into the EA App and put it in offline mode, then disable wifi and/or disconnect the ethernet cable before pressing Play.

If that helps, you can try keeping your computer online but leaving the App in offline mode.

If it doesn't help, please create a new admin Windows account and try playing there.  Make it local, as in, don't link it to your Microsoft account or any email address.  You'll be able to launch the game without reinstalling anything, but your saves and other content won't be available.