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So you finally decided that it is time to upgrade to the latest Microsoft operating system, but the upgrade process fails due to a 80040020, 8024600A, or 80080080 error. Well, you have reached the right web page.

The upgrade to Windows 10 is being handled via Windows Update as a “normal” update. Your current OS needs to download a lot of files to be able to retire and to free the way for the youngest MS OS. The specified errors indicate that something with the downloaded Windows 10 installation files went wrong; one or several of the required installation files are missing, or maybe the Windows 10 installation folder has been corrupted due to issues with your current OS, internet connection, and/or hardware system.

All you have to do is to try again, but how… Here is how:

  1. First you have to delete all data downloaded in the Software Distribution section of your current OS. In order to do that, you have to navigate to C:\Windows\SoftwareDistribution\Download, and then delete everything in that folder.
  2. Now, you have to press Win+R to open the “Run” window, and then run the command prompt as an administrator. Once you are inside CMD, please type in wuauclt.exe /updatenow and then hit enter.
  3. Navigate to Control Panel -> Windows Update to ensure that the required Windows 10 installation files are being re-downloaded
  4. Sit back and relax (! Very important step!)