Installation Failure: Windows failed to install the following update with error 0x80240020: Upgrade to Windows 10 Pro.
Update – Note that this didn’t work for me. Still waiting to find a workaround, otherwise I’ll try using an ISO instead
Eagerly waiting for Windows 10 to upgrade my PC.. But nothing was happening. I noticed this error in the Event Viewer System Log:
“Installation Failure: Windows failed to install the following update with error 0x80240020: Upgrade to Windows 10 Pro.”
This thread suggests the cause may be a corrupt download.
The solution (repeated here):
- Delete the contents of
- Open an elevated Command Prompt and run
- Go to Control Panel | Windows Update and click Check for updates.
After a minute or two, you’ll notice some new files appear in the Download folder, and the Windows Update status will change similar to this:
I’ll update this post if there’s anything else that requires attention to complete the upgrade successfully.
Later that same day…
and even later…
The installation failed with the same error