Is it safe to buy a cheap Windows 11 Pro key from Kinguin or G2A?

It can be – safety is a function of the key’s source and the store’s guarantee, not the storefront logo. Marketplaces concentrate the widest seller variance, so use platform buyer protection, pay with a protected method, and screenshot your activation the day it succeeds. Our buying guide explains where cheap keys come from and which tier fails.

Which is cheaper: CDKeys or SC DKey?

Observed bands overlap – roughly $15-30 for a Windows 11 Pro key across the four stores in September 2026, with promotions swinging any of them cheapest in a given week. A few dollars of sticker difference matters less than the refund window behind the key, because that is what pays out if a batch is ever flagged.

Can a cheap Pro key upgrade Windows 11 Home to Pro?

Yes – a Pro key upgrades Home in place via Settings > System > Activation, with no reinstall. If the switch throws an activation error, our activation guide and the Home-to-Pro upgrade guide cover the fixes for errors 0xc004f050 and 0xc004f069.

Where to Buy a Windows 11 Pro Key: 4 Stores Compared (2026)