Found this at Lifehacker, that may be of interest to you XP and Vista users. If you install the Windows 10 Preview on your Windows XP or Vista computer, establish a valid Microsoft account, you will then be eligible for the Windows 10 upgrade (for FREE).
As Microsoft details on its Windows blog, if you’re running the Windows 10 Technical Preview as part of the Windows Insider Program, and you have a valid Microsoft account connected to your installation, you’ll be upgraded to Windows 10 for free. If you’re already in the program, future builds will prompt you to connect your Microsoft account if you haven’t already done so.
While this is good news for those on the preview builds, it’s also a handy workaround for anyone who might be getting left behind when the free upgrades start rolling out. — source: Lifehacker
If interested in exploring the option of installing the Windows 10 preview, Lifehacker also can help you out with instructions on performing the installation, as well — CLICK HERE
Of course, make sure your computer meets the Windows 10 system requirements. Not sure? CLICK HERE to get those requirements.
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