SCCM Error 0x80240020 feature update

In case you are using servicing to deploy your feature updates, you might get updates stuck with error code 0x80240020.

Whenever you click on retry it fails very quickly, too fast to be true. Indeed the real error the first time you try to install the update is 0xC1900208 (That is also 1047526904), error that you might be more familiar with (and that is more “googlable” as well).

It means that your system doesn’t meet the upgrade requirements. Once this error raised the windows update client is getting in an inconsistent state and all following attempt of installation (even when prerequisites have been solved) will fail with this error  0x80240020.

So how to solve it:

• Delete the C:\$WINDOWS.~BT folder (folder is hidden)
• Delete the content of C:\WINDOWS\SoftwareDistribution\Download folder

If it’s not obvious on which product is the root cause of the migration failure you can find logs in C:\$WINDOWS.~BT\Sources\Panther\Setupact.log. usually it’s your antivirus or another program you already know to have compatibility issues. The other option is to run the installer manually to identify issues.

Thanks to https://www.systemcenterdudes.com/sccm-windows-10-feature-update-error-0xc1900208/ for the post. I am just posting this as I had issue finding it with error code 0x80240020 that is the one you will most probably have.