Hi @FlabbaWokei - That does sound really frustrating! First issue - as you probably already know - if your iMac is running MacOS Catalina, SimCity 2013 won't run at all. Apple dropped support for 32-bit games like SimCity beginning with Catalina, so the program won't run.
Luckily, you have a PC, so you can run SimCity 2013. When you say you transferred the game files from Mac to PC - did you copy the game files, or just the data files? The city save files should transfer between different platforms, but the game files themselves will have to be installed via Origin. I've never transferred cities from Mac to PC, but I have successfully transferred from one PC to another. I don't think there's a difference in the city save files themselves, but can't say for certain. This is for OFFLINE city files only. Online files are on the EA servers, and you don't need to transfer anything. Just log into the same account you were using on the Mac - select the server and you can continue playing your online regions from there.
So, first thing - download and install Origin on the PC; log into the same account that you were using on the iMac. In your game library you should see all of your registered games. From there, download and install SimCity 2013. Make sure to run installation files "As administrator", and that Origin.exe and SimCity.exe are added to your antivirus exception lists. Then ensure that you can open and play SimCity without the transferred files.
If you've already installed Origin and SimCity on the PC, then delete the contents of your game files from \Documents\SimCity\Games (this is assuming you have a copy of the folder from your Mac - you can move the game files to a protected area on your desktop or something if you don't). In Origin, right-click the SimCity icon and choose to "Repair Game". This will compare the game files on your PC and replace any that are corrupted or missing. Open SimCity and make sure you can run it. Then, exit SimCity completely and copy JUST the contents of your Mac folder Documents/SimCityMedia/Games to the PC folder \Documents\SimCity\Games folder. When you run SimCity, you should see all of your regions and cities in the offline menu, and be able to open and load them just as you did on your Mac.
TLDR:
- Download and install Origin on the PC
- Install SimCity in Origin
- Log in to SimCity and ensure it runs correctly
- If cities are online, from the Multiplayer/Online tab, choose the correct server and find your region(s)
- If cities are offline, log out of the game and copy the contents of the Mac's Documents/SimCityMedia/Games folder to the PC's \Documents\SimCity\Games folder
I hope this helps - let us know. 🤞