How to format your drive APFS on macOS 10.13 (High Sierra) to 10.15 ( Catalina) | Support Seagate US
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Ask macOS earlier version when going inst… - Apple Community
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You can still upgrade to macOS Catalina – JimmyTech
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How to Update Your MacBook Air Laptop
MacOS Catalina 10.15.4 Supplemental Update Released with Bug Fixes | OSXDaily
I am trying to update my Mac software to MacOS Catalina version 10.15.7, but when I try to, this comes up so it won't let me. I currently have MacOS High Sierra
