Simcity update 10

Hi @mkenber - On installation, SimCity downloads the most recent version, which is update 10.3. There will be no other patches or updates beyond the downloaded version, as SimCity is a legacy game and is no longer actively developed.

You should already have this version. On the main load screen, there should be two tabs. Click on the Single-Player tab to switch to offline mode and build cities offline. If you're not seeing this tab, try exiting the game and then put Origin offline (in the Origin screen, click "Origin" > "Go Offline"). To see how to transfer any regions that you made online, you can reference the update release notes here: https://answers.ea.com/t5/SimCity-2013/SimCity-update-10-3-release-notes/td-p/4084353

If you're playing an old copy of SimCity and it hasn't been updated properly, try a game repair. You have to be online for it to work, but open Origin and right-click the SimCity icon. Choose "Repair" and the game will update. 

If you have any specific errors or can't find a single player tab after following these steps, reply back and let me know what's happening. Happy Building!