can a imac 2011 or later be updated to the newest OX?
can EL Capitan 10.11.6 be updated to the newest OX?
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No, it cannot go beyond 10.13.6. In order to run Catalina (10.15.x) Macs must have GPUs that support Metal which is a graphics capability. This did not become available on iMacs until the 2012 models. And if you are wondering, no a 2011 cannot be upgraded to support Metal and no there is no work around. If you want or need 10.15.x then it is time to invest in a new iMac or newer Mac.