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Microsoft is blocking Windows Customization Tools
(www.neowin.net)
This is a most excellent place for technology news and articles.
.... I don't, actually, I've been using ClassicShell basically since the day Win10 came out and it's always worked perfectly. Don't think I've even updated it actually.
Its something happened waaay back during the technical preview days. Just like with this instance, the workaround was to rename the installer executable.
https://winaero.com/microsoft-to-block-classic-shell-in-windows-10-here-is-why/
And I think you should update to OpenShell at least.