Use this generic key (cannot activate Windows, only unlocks download):
Once you have the ISO, create a bootable USB with Rufus and install. But remember: Windows 8.1 is no longer supported. If you need a stable, secure OS, move to Windows 10 or 11. windows 8.1 iso download 64 bit
However, searching for "Windows 8.1 ISO download 64 bit" can lead you to shady third-party websites filled with malware, modified installers, or outdated versions. Use this generic key (cannot activate Windows, only
How to Safely Download Windows 8.1 ISO (64-Bit) – Official & Legal Methods windows 8.1 iso download 64 bit
Go to: https://www.microsoft.com/software-download/windows8