For those with AMD builds, it might be worth updating your motherboard BIOS to the latest version.
I was having this same issue, and none of the fixes in this thread worked... until I updated my BIOS. Afterward, the "Upgrade in Place" procedure outlined here worked like a charm -- and several subsequent Updates installed without an issue using the normal "Install & Reboot" process.
So, if you're running an AMD with an older BIOS (mine was from 2016; the new version is from 2019), it might be worth a shot.
Do not have AMD motherboard.
Any other suggestions ?