Hi Belle,
If you're having problems updating, it's been suggested to exit the game, and close out of Origin. Restart the computer, and try updating again.
It may help to clear all cache files. (Read below for details) -- If that doesn't work, uninstall and reinstall the Origin client.
*** It will not update if the game is running in the background.
Delete Cache Files
http://sims4.crinrict.com/en/2014/09/delete-cache-files/--
Documents > Electronic Arts > The Sims 4 >
It's safe to delete the localthumbcache.package file
- In the cache folder (Do NOT delete the folder)
cache –> *.cache (all files ending in cache)
- In the cachestr folder (Do NOT delete the folder)
cachestr –> All content can be deleted
Delete Origin Cache Files
http://sims4.crinrict.com/en/2014/09/delete-origin-cache-files/Hope this helps, and Welcome to the forum!!
MrsFlynn