What type of update are you trying? Most normal updates will not need to restore your previous version but will just fail. We always suggest you disconnect external USB devices and if you have any devices you can disable, it might help.
I don't know what 'Windows Update' you are trying to update? Please state the exact update if its a featured update or a cumulative update? Furthermore, if you are trying to update a 'Windows cumulative update' of an OS Built e.g. 1803 then go to this link: https://support.microsoft.com/en-au/help/4099479 as you can get a 'standalone' and download the appropriate download for your system and install them that way.
Remove the wifi card and hook your pc up to your router to dl the latest versions.
If you are looking for the v1903 (May 29, 2019—KB4497935 (OS Build 18362.145) then and firstly your system has to be ready and/or have all the updates of v1809 and be ready for the new v1903! The easiest way to install and know if v1903 is ready and/or can be installed is toSimply looking for Update 1903 on MS site and install the same, all will be taken care off.
How long do you wait to get past the 81%.? If the icon is moving it is trying to get past a (untrimmed or grossly fragmented Drive). I have seen some to take up to 3 hours.. Next you tried to update which method are you TRYING> ? (1) DL from Microsoft, (2) home brew UUP convert, or (3) unofficial DL.
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