Win8.1 upgrade Win10 system to 99% pop-up error code 8024031 failure reason and solution

Solution:

1. Press Win+R to enter “"services.msc” (do not quote when typing) and press Enter. If the User Account Control window pops up at this time, please click “Continue 

2, find and double-click in the service window to open “Background Intelligent Transfer Services" service;
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3. Click on the “General” tab to make sure that “Startup Type” is “Auto” or “Manual”. Then click the “service status” button below.

4, in the same steps, "Windows Installer", "Cryptographic Services", "software licensing service" and "Windows Update" are enabled.

The above is the Win10 system upgrade to Win8.1 to 99% pop-up error code 8024031 is mainly caused by the system-related services are not open, the method is very simple, refer to the above method to restart the service can upgrade win10.