Many people are getting an error 80240020 when updating to Windows 10. This is due to an incomplete download or a corrupted download. Here is a solution.

1. Browse to C:\Windows\SoftwareDistribution\Download.

2. Delete everything within that folder.

3. Open a command prompt as Administrator. Type wuauclt.exe /updatenow

4. Go back into Windows Update and you should see Windows 10 re-downloading. When it is complete, you should be able to upgrade to Windows 10 with no issues.

 

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