- Close SimCity launcher
- Go to \SimCity\SimCityUserData\Patches\UpdatedApp
- Copy every file (CTRL+A then CTRL+C)
- Then go to \SimCity\SimCity
- Paste all the files into that locations (CTRL+V)
- When asked if you want to copy and overwrite, select YES
- Run SimCity again
You should be able to get into game now.