I just talked to an EA rep from customer service to fix this. It's super easy! Here's how:
For game purchased with a physical disc:
-Open My Computer and go into Local Disk (C: )
-Go into Program Files. If there are two folders labeled Program Files, go into the one that says Program Files (x86). Mine said x86, yours could have a different number because it is just the number of files.
-Go into the Electronic Arts folder
-Go into the file labeled Game
-Go into the Bin file
-Inside the Bin file, you will see TS4.exe. Click on that and drag it to your desktop to move it temporarily to your desktop.
-Open Origin and go to your games so you can see The Sims 4 cover. It should no longer be grayed out and it will have an option to Install. Click that.
-Wait until the bar at the bottom of Origin says the install is complete. If you look at the game it will still say Install as an option but that's ok. Now you can minimize Origin
- Drag TS4.exe from your desktop back into that Bin folder that you took it out of.
-Check Origin again. It should be fixed!😕mileyvery-happy: