15 minutes only for an install to SSD whereas a big feature update via windows update can run for hours and leave you with windows old folders wasting many GB. It was still n a mostly usable state still, but the fix had to be a clean reinstall of latest version from dvd or usb. I have experienced two instances where W10 became a bit damaged and would not install the next big featured update. Right-click the Start button to find that option. msi by copying its path into a Windows Command Prompt Box with elevated (administrator) privileges works, even if one is already an Administrator. I also found that installing the Calibre. Run Calibre from a desktop shortcut for which you have changed the shortcut's Properties to always run as an Administrator. It might have not installed correctly due to an inability to create temporary or other directories due to a lack of security permissions.

If you were a simple User, after changing yourself to be an Administrator, reinstall/repair Calibre via its. Regardless of the version, ensure you are an Administrator and not just a simple User. I have experienced the identical problem on a 2-in-1 tablet and resolved it by upgrading from Version 1803 to 1809, which often repairs any security/permissions errors since it resets so many things in the upgrade process. Other people do not have your exact hardware and software configuration and installation history. Remember that every Windows PC has a unique software environment. I have never experienced this problem on any of my desktops. The problem you are having is becoming more common on certain Windows 10 Home tablets that are originally Windows 10 Home (never upgraded from 7 or 8.1), and originally installed with a more recent version of Windows 10 Home that has had their boot and other security continually 'improved'. Looks like a possible security/permissions error.

Calibre windows 10