Read about, and download the SimCity Pak Mod Tool.I highly recommend it.įor an explanation on how the mod manger works, watch Monte Rico's video below. Thankfully there is a mod manager that can be used to toggle between Online and Offline games. If you run an Offline Mod in an online game it will cause rollbacks and crashes. Thankfully, the offline mods usually start with 'Offline If you try to play an Offline-Only mod in an Online game, you'll get errors and rollbacks. Some mods can only be used in Offline mode.If you don't use the default location, some mods won't work. Is origin installed in the default directory? It should be in C:\Program Files (x86)\Origin\ and the games should be in C:\Program Files (x86)\Origin Games\SimCity\SimCityData.If you can't get one to work, try another to make sure it's not the mod itself with the problem. Make sure the first one works before installing additional ones. Try installing only one and see if it works. If you're downloading your mod from simtropolis, make sure you've signed in to your account.If it comes with a readme.txt file make sure to check that out to make sure there's not some other process. Note: Sometimes mods will have different installation routines.