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Hello, I apologize for not updating on this.
Update: In my case the problem was that I previously had a hardlink from C:\Windows\Installer (which contains installer cache files) to another drive. This has always worked for me in the past, but seemed to start making problems recently, POSSIBLY because of a Windows update where something was changed. (I experienced the installer problem then not only with calibre, but other software as well).
In my case, I just stopped using the hardlink to link to another drive, but just restored my folder C:\Windows\Installer and everything worked again.
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