If you were hoping to join the Windows Insider program, you’ll now have to wait until after Windows 10 launches.

As WinBeta points out, Microsoft has deactivated all Windows 10 Insider Preview product keys for builds prior to 10240. That build only works as an upgrade from previous Preview releases, which means Microsoft is cutting off anyone who hasn’t already activated the Windows 10 Insider Preview by now.

In a support forum post, Microsoft explained its reasoning: Windows 10 is only meant to for “Genuine Windows” devices, but in previous builds, users could perform a clean install on any machine. Those users will get to stay on the Windows 10 Insider track indefinitely, so the Preview was effectively a way to get semi-legit Windows without buying a license. That practice ends now.

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