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I did the purge and now see start10 in the start menu, but can't activate. I get this message when I click on it.

Once Windows 11 was installed I had to uninstall start 10 before buying and installing start 11. I then restored to Windows 10. I downloaded start 10 again but it will not install. The messages that I have to restart before it will install but I've restarted several times and it still doesn't install.