Solved
Sims 4 wont open "because the below file appears to be corrupted." error message
I accidentally installed a sims 2 cc into my sims 4 mods folder and now I keep getting the "Cannot start because the below file appears to be corrupted. If this file is a Mod please remove it and try...
Move your Mods folder to the Desktop and delete localthumbcache.package. Then test the game in a new save.
If it works now check for updates to your Mods and CC. Add it back a little at a time while testing until you have found all that are broken.
