System update
Is a computer that is running 10.13.6 able to run the new update?
iMac 21.5", macOS 10.13
Is a computer that is running 10.13.6 able to run the new update?
iMac 21.5", macOS 10.13
If it's a late 2012 or newer then you can upgrade to Catalina 10.15. Go to Apple menu > About this Mac to find out.
System update