WHY windows 8.1 enterprise NOT upgrade TO windows 10 FREE

AND MICROSOFT LET THAT FOR

windows 7

windows 8 & 8.1

I bought a license a long time ago LIKE windows 8 professional

BUT HE CAN upgrade AND I'M NOT

it not fare AND VERY BAD FROM MICROSOFT

Hi,

Because Windows 8.1 Enterprise need Volume License authorized. Windows 10 Volume License upgrade is not free.

You can access to the link below for more details:

http://www.microsoft.com/en-us/Licensing/product-licensing/windows10.aspx