Restart your PC and enter the BIOS/UEFI settings. Set the USB drive as the primary boot device.
| Source | Legitimacy | Access Method | | :--- | :--- | :--- | | | Official | Only for enterprise customers with active Software Assurance agreements. | | Microsoft Evaluation Center (Archived) | Official | Historical evaluation ISOs (may be time-bombed). | | Internet Archive (archive.org) | Unofficial but community-trusted | Hosts Microsoft MSDN original ISO images with checksums. | | TechBench by WZT | Third-party (widely trusted) | Downloads directly from Microsoft’s remaining CDN links (if still active). | windows 8.1 pro build 9600 download iso 32 bit
Always verify the SHA-1 checksum against Microsoft’s official database (if available) or known clean MSDN uploads. Restart your PC and enter the BIOS/UEFI settings