This guided walk-through provides steps to fix problems with Windows Updates, such as taking a long time to scan, or error codes while installing updates.
I am trying to upgrade it to Windows 10 using Media Creation tool but the upgrade is stuck at Making sure you are ready to install for more than 12 hrs.
Try disconnecting your PC from the internet>close Windows Update>reopen windows update and see if an install (not download) button is showing and click it.