Win10 upgrade error 0x80240020 how to solve?

1. First, you need to return to the traditional desktop location of the win10 system. After that, press the win+X shortcut on the win10 computer keyboard to open the shortcut menu of the computer. In the shortcut menu that opens, click to select the command prompt. (Administrator), but note that this item must be selected with the word "Administrator".
2. In the open command prompt window, type net stop wuauserv and click Enter.
3. After that, open C:Windows, rename the SoftwareDistribution folder to SDold, and then return to the command prompt window again, enter net start wuauserv and click Enter.