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Windows 8.1 reached the end of Microsoft support in January 2023. It remains a valid option on hardware that predates the Windows 10 requirements, or when a program or a peripheral was certified for that generation and never revalidated afterwards. Chkey.ch offers Windows 8.1 Pro keys at Swiss prices.
Pro is the edition worth having, adding BitLocker, the Remote Desktop host, Hyper-V and domain join to the standard build. Windows 8.1 is lighter than Windows 10 on old hardware, and it restored the Start button and the boot to desktop that the original Windows 8 had dropped.
Your key is emailed within 24h, Swiss invoice included.