Fuente: http://www.nosolohacking.info/como-resetear-los-dias-de-prueba-de-terminal-services-rds/
wmic /namespace:\\root\CIMV2\TerminalServices PATH Win32_TerminalServiceSetting WHERE (__CLASS !="") CALL GetGracePeriodDays
(Invoke-WmiMethod -Path (gwmi -Namespace root\cimv2\terminalservices -Class win32_terminalservicesetting).__PATH -Name GetGracePeriodDays).daysleft
$obj = gwmi -namespace "Root/CIMV2/TerminalServices" Win32_TerminalServiceSetting
$obj.GetSpecifiedLicenseServerList()
$obj = gwmi -namespace "Root/CIMV2/TerminalServices" Win32_TerminalServiceSetting
$obj.SetSpecifiedLicenseServerList("SERVIDOR")
Para seguir el tutorial abrir el video en youtube: