AlonsoMoreno2_917,
I have the same issue.
I have successfully installed Win10 20H2 through the normal Update process on two PCs and thee Laptops. However, I have one PC that fails (multiple times) but backs out the change and recovers.
Today I tried a full install (via a Media Creation Tool USB Flash Drive) on the problem PC. During the install attempt, I deleted the Windows partitions (System, Reserved, Primary, and Recovery) so its not some bad device driver or anything else on my hard drive.
I made it through the install up to the point it wants you to sigh on to you Microsoft account. Then it dies with a blue screen reporting a page fault from a non-paged address. I have run memory diagnostics with no errors. I use this PC every day with zero errors on the previous 2004 (20H1) level of Windows 10.
After the failed install of 20H2, I reinstalled 2004 (20H1) with no issues. After the 2004 (20H1) install completed, I tried Settings - Update which failed, and then backed out KB4586781.
Here are the Event Logs with the install errors:
Installation Failure: Windows failed to install the following update with error 0x800F0845: 2020-11 Cumulative Update for Windows 10 Version 2004 for x64-based Systems (KB4586781).
The computer has rebooted from a bugcheck. The bugcheck was: 0x00000050 (0xfffff28000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000006).
A dump was saved in: C:\Windows\MEMORY.DMP. Report Id: 13e51ec1-1520-4bb7-ad72-11c13683b610.