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Download Windows 8.1 - microsoft.com
Download Windows 8.1 Disc Image (ISO File) - microsoft.com
Windows 8 - Wikipedia
Windows 8.1 - Wikipedia
Windows 8.1: Everything You Need to Know - Lifewire
Update to Windows 8.1 from Windows 8 - Microsoft Support
How to download the official Microsoft Windows 8.1 ISO
Install Windows 8/8.1 From USB [Full Walkthrough] - Lifewire
Create installation media for Windows - Microsoft Support
Windows 8.1 support ended on January 10, 2023