As of 2026, the standalone for direct download from the primary Microsoft software download page. Microsoft ended extended support for Windows 8.1 on January 10, 2023 , and has since prioritized tools for Windows 10 and Windows 11. How to Download Windows 8.1 64-bit ISO
Yes – Microsoft still activates Windows 8.1 using valid product keys. However, mainstream support ended in 2018, and extended support ended in January 2023. That means: windows+81+download+64+bit+media+creation+tool+link
If the Media Creation Tool fails, you can still download the 64-bit ISO directly using an official Microsoft server trick (requires a valid product key): As of 2026, the standalone for direct download
The primary way to get Windows 8.1 installation files now is via the official Microsoft Software Download As of 2026