Uppdate my early 2013 Mac Pro from High Sierra OS 10.3.6?
Can I update my Mac Book Pro early 2013 High Sierra OS version 10.3.6?
MacBook Pro 15″, macOS 10.13
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You can upgrade to Catalina 10.15.7.
Be aware older 32bit software will no longer run and will need updated or replaced. You can find which you have with Go64.
Get Catalina here: How to download macOS - Apple Support