Not able launch unreal engine in iMac(27-inch, Mid 2011)

I am facing attached error message while launching Unreal Engine(4.23, 3.22 and 4.19). I am using iMac (27-inch, Mid 2011) computer with below configuration.

Manufacture and model - Apple iMac(27-inch, Mid 2011)
Processor - 3.4Ghz Intel Corei7
Memory - 20GB 1333Mhz DDR3
Graphics - AMD Radeon HD 6970M 1024MB

Which version Unreal engine can be installed on this machine. Kindly advice


Sorry friend, but I think you mac is too old. You might be able to if you change the card. I see this list, but I’m not vouching for it ( not being a maccy ):