i just installed windows 8.1 and now it notified me to install windows 10. when i did it, after 5 minutes it said 1 update failed to install. i then went to https://www.microsoft.com/en-us/windows/windows-10-upgrade and then it downloaded easily. im afraid that the windows update did not install though and i have to revert back to windows 8.1 to install that update and then go back to windows 10. i already checked for updates and installed them all in windows 10, but what do i do for the failed one? did it install when i checked for updates?