catalina 10.15.7 to mac 11

The macOS version you can upgrade to depends on the year your Mac was released.

Click the Apple menu () at the top of your screen and choose About This Mac.

Check the Compatibility of your Mac with newer versions of macOS:

➡️ macOS 11 Big Sur is compatible with the Macs listed here

➡️ macOS 12 Monterey is compatible with the Macs listed here

➡️ macOS 13 Ventura is compatible with the Macs listed here

➡️ macOS 14 Sonoma is compatible with the Macs listed here

✅ - Download the appropriate macOS upgrade installer app:

Click > macOS 11 Big Sur,  macOS 12 Monterey,  macOS 13 Ventura  or  macOS 14 Sonoma.

Once downloaded, double-click the “Install macOS…” app in the Applications folder to begin the upgrade.

Please see > How to download macOS - Apple Support.

macOS 11 Big Sur is full compatible with iMac (2014 or later). Can't see the specific model of iMac from your signature.