Windows 10 technical preview is now available for Windows 7 SP1 and Windows 8/8.1 with all the latest updates installed. All you have to do to get this preview is just go to your built-in Windows updater.
There has been a recently added option feature built into the Windows 10 Technical Preview to load a boot loader which allows you to return back to the previous release. Windows seems not be focusing on their versions but more now on working on the general user experience.
Hopefully the new version of Windows wont fall into the bracket as the other bad operating systems like Windows Vista and Windows ME. The release for Windows 10 is expected to be sometime in October 2015. This upgrade will be free for a year to Windows 7 SP1 and Windows 8.1 users that have their system updated to support downloading the new OS.
Hopefully the new operating system will come with a price drop so that everyone can at least everyone can pick it up.
Source – NAG