In late June, Microsoft announced the upcoming release of Windows 11 and is now releasing early preview builds to Windows Insiders in the Dev Channel. Not everyone, though, will be able to participate in the Windows 11 Insider program, because the new operating system has more stringent system requirements than Windows 10.
As outlined in this Microsoft blog post, if your PC fails to meet the minimum hardware requirements for Windows 11, you will not be able to join the Insider Dev or Beta Channels. You may instead join the Release Preview Channel for testing Windows 10 preview updates. (See our guide to Windows 10 Insider Preview builds for details about what each Insider channel means.)