Had the misfortune of needing to rebuild a Windows 10 Pro machine. The only install DVD that I has was from July 2016 – so almost 4 years old.

Install went fine, but was left with the install at build 1511. But for the life of me, couldn’t get it to update.

There are a bundle of random pages on the Internets, like https://answers.microsoft.com/en-us/windows/forum/windows_10-update/windows-10-wont-update-error-code-0x80240fff/4fe63cab-0bef-4093-bad1-650c779dbbd0

But none of the suggested fixes worked. One thing that did ring true was that this may occur “when trying to update from old builds”.

Solution: Run the Windows Upgrade Assistant: https://support.microsoft.com/en-nz/help/3159635/windows-10-update-assistant

This manually pushed the machine to the December 2019 build and then updates ran fine after that.

Windows 10 update Error code 0x80240fff

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