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Use a tool like Rufus to "burn" the ISO onto a USB drive (at least 4GB or 8GB).
Still Stuck on Windows 8.1? How to Upgrade to Windows 10 or 11
Before installing, ensure your hardware meets these minimum specs:
If you or your organization has a volume license, you can still sign in and download the Enterprise ISO from the Microsoft VLSC .
Windows 8.1 enterprise x86 : Microsoft : Free Download, Borrow, and Streaming : Internet Archive. Internet Archive Windows 8.1 with Update 1 .iso - Microsoft Q&A
After installation, run Windows Update immediately. Although "official" support ended, many final security patches are still available for download. ⚠️ Important Considerations
Official direct downloads for the Enterprise edition are no longer publicly available on Microsoft’s main evaluation pages. You typically need one of the following:
