www.techrez.com/2014/10/download-windows-10-technical-preview-now.html
Microsoft has successfully transited from internal previews to an open invitation which says, “Join us as we build Windows 10.

However, we must point out that, you install the Windows 10 technical preview on a spare PC. This version of of Windows OS comes without warranty. Alot of things can go wrong if you install this on your dedicated PC, data could go missing and that could really cost you much.

Microsoft is asking only users who want to genuinely becoming a part of the process to get involved, “This program is designed exclusively for people who want be involved in the process.” We prefer, ‘exclusively for anyone who dares’.

If you are not an expert, using this product might not be for you and Microsoft has warned, “We’re not kidding about the expert thing. So if you think BIOS is a new plant-based fuel, Tech Preview may not be right for you.”

System Requirements

Basically, you need a machine with at least 1 GHz processor, 1 GB RAM, 16 GB HDD and a graphic card that can run Direct X9 with WDDM driver effortlessly. Also, internet connection and a Microsoft account is required to complete the process.