First of all, you need to know what Windows setup liting/slimming means? And what are their benefits? The answer is:

• Liting is to remove/disable useless, superfluous or cumbersome Windows features
• After liting, you will be able to install Windows 10 onto old PC with much lower hardware configuration. More important is - they run much faster than before

Skip the Windows 9, Windows 10 became Microsoft's latest operating system, and its Insider Preview edition has been released for some time (now it has been Insider Preview). Fully named Windows 10 Insider Preview, with OS (Kernel) version NT 6.4 (Windows 8 is 6.2, Windows 8.1 is 6.3).

Windows 10 began to introduce a new way of legal authorization - digital license activation. Its most obvious feature is that it does not need the traditional product keys or activation codes. Instead, it uniquely identifies a user by recording and comparing the hardware information (HWID) of the user's current computer, thereby is able to automatically reactivate Windows 10 after reinstalling system in the future. The advantage is obvious: the user does not have to remember his Windows product key or activation code any more; and as long as your hardware is unchanged, you can always quickly, automatically and permanently reactivate your Windows 10 with ease.

Digital license is a simpler and more efficient way of activation/authorization newly adopted by Windows 10, which only relies on the configuration information of your computer hardware. After activating system for the first time, as long as you don't change the CPU and other devices connected to the mainboard, you can feel free to connect to Microsoft server to repeatedly, automatically and permanently activate your Windows 10 at any moment, without having to input the product key again and again every time you install the system.

As of this writing, the version of Windows 10 has switched from RS Pre-release to RS2 Release branch, i.e., it has entered the phase of RC. In other words, Windows 10 operating system has formally stepped into to a comprehensive upgrade & update stage.