Re: Bought Sims 4 Outdoor Retreat -- Game not showing up in My Games list!

The Play button in Origin is gray

Make sure your game is updated to the newest version (see above). If that is the case and the play button is still gray, try the following things

• Restart Origin
• Right click on the Game in Origin and hit Repair Game
• Delete your Origin Cache files
• Log out and back in
  
  

source: http://answers.ea.com/t5/The-Sims-4/FAQ-Installation-Updating-and-Startup-Issues/td-p/4276949#gray