*
Customers pay only the cost of Software Assurance. See also visitor comment below.14393.0.160715-1616.RS1_RELEASE_SERVER_EVAL_X64FRE_EN-US.ISO
*
Customers pay only the cost of Software Assurance.dism /Online /Get-TargetEditions
to discover the editions you can upgrade to, then dism /Online /Set-Edition:<edition> /ProductKey:<key> /AcceptEula
then reboot