Win7/Win8.1 upgrade Win10 installation failure error code 0x80070002 solution

Microsoft has officially released the long-awaited Win10 official version system at 12 noon yesterday in Beijing time, and has already begun to pass the "Get Windows10" tool before this Pushing Windows10 official version upgrade to Win7/Win8.1 users, so many users have encountered the problem of upgrade installation failure during the upgrade process. How to solve the 0x80070002 error code? Let's take a look at the details!
Error Code 0x80070002:
This error code was also encountered before. Prompt you  Windows can not find the required installation file [boot.wim]. Please verify that the installation source is valid and restart the installation. Error code: 0x80070002.

Microsoft Chieftain has given a temporary solution, you can run the setup.exe in the Sources directory of the backup Windows.~BT folder to upgrade. And before running, it is best to modify the properties of the backed up $Windows.~BT folder, right click on the $Windows.~BT folder, cancel the “read-only> and “hide” properties, and try again.