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Many thanks to all who have replied.
I'm running Windows 10 Home, 64bit, Version 21H2, Build 19044.1826, with the Windoes Experience Pack Windows Feature Experience Pack 120.2212.4180.0.
I rebooted and tried again to install Calibre 6.1 (calibre-64bit-6.1.0.msi) - same failure, same error message.
Based on your suggestions, next I will try to uninstall my Calibre 5.42 and download and install Calibre 5.44.
Will get back to you with the result.
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