Cannot Open Sim 4 after Life and Death came out.

@barefootedmama  Does this happen with nothing in the Sims 4 user folder other than what the game creates on its own?  As in, no saves, no mods or cc, no Tray files, etc.?  If not, please move this folder to the desktop, or rename it, and try again.

If that 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 (try to) launch the game without reinstalling anything.

If you still can't play, please look for new errors in the Reliability Monitor.  Hit Windows key-R and enter "perfmon /rel" without quotes, and you'll see a chart of errors and updates with a column for each day.  Today is on the right.

Look for an error that happened at exactly the time of your most recent attempt to launch Sims 4, specifically in the new account.  If you find one, double-click it to see more details, then copy that info and paste it into a reply here.  If you don't see a new error, check back in an hour or so—the Reliability Monitor doesn't always update right away.