If you’re buying a new copy, the update will be available in Home and Pro versions on Microsoft’s website and at select third-party retailers, just like Windows 10. It's worth noting that while Windows 11 Home requires a Microsoft account and an Internet connection to activate, Windows 11 Pro does not.
Windows 11 officially arrives October 5, and you can read our Windows 11 launch live blog to keep abreast of all the news, problems, quirks and other tidbits of information as it happens.