Microsoft has released the Windows 10 Technical Preview and you can download it now.
Processor: 1 gigahertz (GHz) or faster
RAM: 1 gigabyte (GB) (32-bit) or 2 GB (64-bit)
Free hard disk space: 16 GB
Graphics card: Microsoft DirectX 9 graphics device with WDDM driver
A Microsoft account and Internet access
1.Sign-up for Microsoft’s Windows Insider Program to get Windows 10 Technical Preview
2.Download the Windows 10 ISO image
3.Burn it to an optical disk or create a bootable USB flash drive.
Windows 10 Technical Preview Direct Download Links:
Technical Preview expires on April 15, 2015.