Copying files from Windows.old blocked by Trusted Installer

[Windows 11]

I just upgraded from Win10 to Win 11 and now have "Windows.old" with many files from my former system. So, I'm trying to do a simple copy of those files to an archive folder. First, Win 11 blocked some by insisting that I get Administrator permission, but it is my personal computer so I granted myself permission. Then Windows Explorer identified some folders I could not copy unless I get permission from "Trusted Installer" which apparently I cannot get. There's a process for identifying all the files and changing the permissions to override this, but I don't know if that's risky and it is als

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