how to upgrade machintos Mac os version 10.4 fro my imac .my serial number is C0***1G5. thanks

hi there,

any possible to explain me how to upgrade my mac os into new version pls....cos i coudnt download apps from my imac since it says:

can't be installed on machintos HD because mac os version 10.15 or later is required.

would you pls help me what is the step that i kust to do.

thank you

dana

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