I found a fix that worked for me @RedWingen on the CK discord
For those who are having issues launching the game (which there are many)
This is a fix that helped
C:\Users(YOURUSERNAME)\AppData\Local\Packages\ParadoxInteractive.ProjectTitus_zfnrdv2de78ny\SystemAppData delete folder called "wgs" then start game, it will start some syncing thing, STOP syncing process and game will run now so uh don't thank me thank a guy named @ Revi on the discord for this if it works for you
Edit: Revi told me to tell you to thank @ VDevs instead
The above + then starting CK3 from the start menu "As Administrator" was what worked for me. Thanks so much!