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Prof.

macrumors 603
Aug 17, 2007
5,346
2,106
Chicagoland
A situation like this is just one example why I prefer to do a clean installation of the new Mac OS by first downloading the full installation file, then stop the "automatic" installation to make a copy of that installation file to another location. Better to be safe than sorry!
The issue was with downloading macOS Catalina. Had you the same issue as us, your method would not have worked because you wouldn't have been able to download Catalina.
 
The issue was with downloading macOS Catalina. Had you the same issue as us, your method would not have worked because you wouldn't have been able to download Catalina.
That might not be necessarily accurate. I have always downloaded the full installation file, instead of choosing to do an update, and then stopped the subsequent installation process. If one chooses to do an update, after the download, it immediately starts the update process.

But I'll bet other folks have been successful doing an update. So not sure why this issue came up. I just know that by downloading the full installation, stopping the subsequent "automatic" installation, and then doing that installation myself (and thus having much more control), I've never had any issues.
 
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