Can you run cs5 on an 21 inch iMac?

Yes, you can run Adobe Creative Suite 5 (CS5) on a 21-inch iMac, provided that the iMac meets the system requirements for CS5. The software is compatible with macOS versions up to OS X 10.6 (Snow Leopard) and certain versions of OS X 10.7 (Lion). Make sure your iMac has sufficient RAM and processing power for optimal performance. If your iMac is running a newer macOS version, you may need to consider compatibility issues or look for workarounds.