If you have a legitimate need for Windows 8.1 (such as legacy hardware or virtual machine testing), use these safer methods instead of unverified "Index of" directories:
As of early 2026, Microsoft has largely removed direct public downloads of Windows 8.1 ISOs from its primary software download pages. Where to Find Windows 8.1 Legally Index Of Windows 8.1 Iso
Businesses with existing volume license agreements can typically access older OS versions through the Microsoft 365 Admin Center . If you have a legitimate need for Windows 8