Windows 8.1 X86 X64 Activated Official
Check second-hand markets for old "Windows 8 Pro" stickers. Those keys almost always work on 8.1. Alternatively, just install Linux Mint or ChromeOS Flex on that old hardware.
Let’s be honest: Windows 8.1 was the black sheep of the Microsoft family. Sandwiched between the beloved Windows 7 and the universally adopted Windows 10, it often gets overlooked. However, there is a dedicated niche of users (myself included) who argue that Windows 8.1 with Update is actually a lean, mean, and surprisingly fast operating system. windows 8.1 x86 x64 activated
But if you are determined to run 8.1? Go for the x64 version if your CPU supports it (most do). The performance is shockingly good for a decade-old OS. Check second-hand markets for old "Windows 8 Pro" stickers