iMac mid2011 unsupportable
don't understand but we know different kind of iMac other devices family like iPad and MacBook Air also included iPhone just only IMac not supported by update High Sierra not proceed on Ventura MacOS?
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Plenty of other Macs besides the 2011 iMac can't support Ventura & even earlier OSes like Monterrey, Big Sur, Catalina!
Mostly you just need a more modern Browser than Safari on Mojave, or High Sierra like Firefox or Brave.