Tonight is the night, Windows fans. Starting around midnight Eastern on Wednesday, June 29, 2015 Windows 10 will start rolling out to Windows Insider members. And if you’re part of the first wave upgrading to Windows 10, your PC may already be primed for the upgrade.

Some Windows Insiders are reporting that Microsoft is already sneaking the Windows 10 installer files into C:/$windows.~BT, according to The Verge. Don’t try getting clever, though: If you try to jump the gun and install Windows 10 ahead of time it likely won’t work since a few key files are still missing.

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