Hi - You need to go to the 1st reply under this thread that mentions copying & pasting a dll file & follow the instructions. Its a matter of replacing the windows 10 Upgrade file with the regular Windows dll file of the same name. Just a simple copy & paste. I followed the procedures & it worked. You do this copy/paste (replace) of the file when the 10 update errors out. Then copy/paste (replace) the file and hit "try again". The windows 10 update will run smoothly afterwards. I am sorry but I did this several nights ago & forgot the exact name of the file but it is in the error code thread.
Good Luck!