“macOS could not be installed on your computer” error.
Before you begin, follow this guide to ensure a smooth transition and avoid losing access to your critical apps. how to update macos high sierra 10.13.6 to 10.15
Once you see the Catalina desktop (note the new “Music,” “Podcasts,” and “TV” apps replacing iTunes), you are not done. “macOS could not be installed on your computer” error
Catalina requires at least . To check:
Ensure you have the (Security Update 2020-006 or later). ” and “TV” apps replacing iTunes)
The most straightforward way to update your Mac is through the Mac App Store. Here's how: