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macos – MacBook Air 2013 not updating software

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New to this site.

2013 MacBook Air refurbished from IBM in 2017.
Factory reset accidentally to original software: mountain lion.

Could update 6 items. the last iTunes update comes with an error code.

Downloaded OS software on my iPhone, from my iPad, and also from a 2013 Windows 8.1. Placed on USB and SD card bootable drive but MacBook cannot download this new software.

I need to get my MacBook up and running and I need help. Downloaded many different versions of macOS from Mountain lion to Big Sur.

Absolutely need this fixed.

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