To Fix Windows 10 Update Error 0x80240fff try this fix:
Google for Windows 10 media creation tool
Click on the first result that will lead you to the official website of Microsoft.
In the webpage, click on “Update Now” as shown in this video. Save the downloading file and run the same if completed downloading.
In the “Windows 10 update assistant” click on “Update now” and follow the on-screen instruction. This assistant will download for you the required files. It may take upto one hour to complete the downloading based on your connection speed. Once it completes the download, you will be asked to restart your system. After restarting, follow the on-screen instructions. One your system reboots your update problem should be fixed..!
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Thank you...!!
@techbee95