Windows 10 is rebooting against the explicit will in order to install updates

Run the Command from an elevated command prompt; see what it tells you.

C:\>powercfg -lastwake

Example from my laptop:

 powercfg -lastwake
   Wake History Count - 1
   Wake History [0]
     Wake Source Count - 1
     Wake Source [0]
     Type: Device
     Instance Path: PCI\VEN_8086&DEV_8C31&SUBSYS_201F1043&REV_05\3&11583659&0&A0
     Friendly Name: Intel(R) USB 3.0 eXtensible Host Controller - 1.0 (Microsoft)
     Description: USB xHCI Compliant Host Controller
     Manufacturer: Generic USB xHCI Host Controller

After thinking about it it occured to me that my Logitech universal dongle was the culprit as it was a HID complaint mouse... Simply disable that in Power management and you should be golden.

Have you tried re-downloading the updates? I noticed Windows 10 sometimes got stuck in the process of downloading or installing updates.

To do this, you need to completely remove all the downloaded update files.

• First of all, you need to temporarily disable the Windows Update service (Go to Control Panel - Administrative Tools - Services, then look for "Windows Update", right click - properties, Stop service, and just put it to Disabled on startup type, just to make sure)
• Now you need to find the location of the downloaded update files, which is in C:\Windows\Software Distribution\ folder.
• Delete the entire content of the folder (or, if you want to be secure, back it up first somewhere else). This will delete all the downloaded update files and windows update history. Don't worry, this WON'T delete your installed updates.
• Now that you've deleted it, turn the Windows Update service back
• At least reboot your Windows once, before trying the update process again.

This method has worked twice on my Windows 10 Home, when it got stuck in downloading and installing the updates.

I hope it works, and cheers.