Sims 4 unable to start; tried all fixes the EA team has suggested to others.

@ExplodingCactus  Which error are you seeing?  There are several that start with "unable to start."  Here's one corresponding master thread:

https://answers.ea.com/t5/PC/CURRENT-ISSUE-Sims-4-Unable-to-Start-Game-Data-Missing-or/m-p/13276818#M264946

For any other error, please post a screenshot of it, and also run a dxdiag and attach it to a post.

https://help.ea.com/en-us/help/pc/how-to-gather-dxdiag-information/