Microsoft removed the official tool in 2022. However, if you have a retail key, you can still download the base ISO from unofficial archival sites like archive.org (look for "Windows 8.1 RTM ISO MSDN") and then manually integrate updates.
, though it is intended for users who already own a license and need to reinstall the OS. Why "Fully Updated" ISOs Are Rare windows 8.1 fully updated iso
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The final official build number for a fully updated Windows 8.1 system is Microsoft Learn Final Update Rollup: Microsoft removed the official tool in 2022
This is the only legitimate way to get a personal, fully updated ISO. Why "Fully Updated" ISOs Are Rare : The
Since Windows 8.1 reached its end of support on January 10, 2023, Microsoft no longer provides "fully updated" ISOs directly. To get a fully updated system, you must download the base ISO and then integrate the final security updates yourself using tools like . 1. Download the Base Windows 8.1 ISO