Microsoft over the weekend relayed some good news for folks running older versions of Windows. It turns out that there will be a way for people still running Windows XP or Windows Vista to upgrade to Windows 10 for free. Previously, it was believed that only Windows 7 and Windows 8 users would be eligible for the free upgrade.

Here’s how it all works.

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In a recent post on its Windows Blog, Microsoft effectively writes that users running Windows preview builds as part of the Windows Insider Program will be able to upgrade to Windows 10 for free. This is certainly welcome news for DIY types looking to run a clean install without having to fork over either $109 for Windows 10 Home or $149 for Windows 10 Professional.

WinBeta writes:

Microsoft has claimed in the past that users upgrading from Windows 7 and Windows 8.1 will receive Windows 10 for free, however that was never the case for Windows Insiders who installed clean. Microsoft consistently said that you would need an existing Windows 7 or Windows 8.1 license to get activated on Windows 10, but now that seems to have changed.

To get in on the action, Windows Insider users must be running the most up-to-date preview release of Windows 10 (build 10130). Once the final version of Windows 10 goes live, these users will be able to download and install it for free.