Scroll down to the "Select edition" section. Choose "Windows 8.1". Confirm: Click "Confirm".
Windows 8.1 Update for x64-based Systems (KB2919355) - Microsoft
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Microsoft occasionally updates its legacy download pages, but the official ISO page remains the most reliable source.
Open Rufus, select your USB drive, and click "Select" to choose the ISO file you downloaded.
Avoid third-party websites claiming to host the old "Windows 8.1 Media Creation Tool.exe" file, as these are often bundled with malware or adware. 📥 Official Way to Download Windows 8.1 64-Bit