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cpoim · 02-22-2025, 03:41 PM

Hi, all.

I have Windows 10. I successfully installed Calibre 7.26.0. The installation did not remove Calibre 7.21.0. Revo Uninstaller shows version 7.21.0 still exists and it takes up 562 MB. When I try to uninstall version 7.21.0, the message displayed is "The installation package could not be opened. Contact the application vendor to verify that this is a valid Windows Installer package." It seems to me that there is only one application folder, C:\Program Files\Calibre2. Any help will be appreciated. Thanks.

02-22-2025, 03:41 PM	#1
cpoim Junior Member Posts: 3 Karma: 10 Join Date: Feb 2025 Device: none	New Install Won't Uninstall Old One Hi, all. I have Windows 10. I successfully installed Calibre 7.26.0. The installation did not remove Calibre 7.21.0. Revo Uninstaller shows version 7.21.0 still exists and it takes up 562 MB. When I try to uninstall version 7.21.0, the message displayed is "The installation package could not be opened. Contact the application vendor to verify that this is a valid Windows Installer package." It seems to me that there is only one application folder, C:\Program Files\Calibre2. Any help will be appreciated. Thanks.