I updated my Windows 10 laptop last week. It took me 2 days!
It kept getting stuck at 61% install, for hours ........then nothing. I ran all the various 'fixes', the Windows troubleshooting tool, the command line instructions and so on. I searched online for 'stuck at 61%'. There were suggestions that there were problems with the sound drivers, so I followed instructions and deleted the drivers (to be updated after the update). I ended up with a laptop I couldn't update and without any sound.
Eventually, I 'reset' Windows 10. I stopped caring about whether I lost any files and just did it. It worked and down-loaded the update and I didn't lose any data. But there was still no sound.
Finally, I ran a system health check (through the command line) and I now have an updated W10 laptop with sound.
I have been increasing frustrated with my Windows laptop. I have just updated an iMac and a Macbook Air to their latest operating systems. Each took a couple of hours, showed a bar on the screen with progress and download speed information, and just 'worked' (although, to be fair, I have had problems in the past, but Apple support was really good).
So ExD, you are not alone in your W10 troubles. I wish you luck.