Start by matching the version: Windows 10 and Windows 11 keys are version-specific, so a Windows 10 key does not activate Windows 11, and a Windows 11 key does not activate Windows 10. Pick the version already on the PC you plan to licence.

Then choose the edition. Home covers everyday personal use. Pro adds BitLocker encryption, Remote Desktop, Hyper-V, domain join and Group Policy, making it the better fit for work PCs and business use.

All four licences here — Windows 10 Home, Windows 10 Pro, Windows 11 Home and Windows 11 Pro — are lifetime, one-time purchases with no subscription, for 1 PC. Each key is delivered by email, normally within 24 hours of payment, with download guidance.