win (NT6.1 +) server version: [2 Remote Desktop Users (single session) [] upgraded to a terminal server multi-user (multi-session)]

One way: rational use 120 days grace period, the system will adjust to a future time, such as, in 2099, to install, configure Remote Desktop Services component, then transferred back the system time

Second way: Microsoft to purchase and activate Terminal Licensing Server

Three ways: promptly delete HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Control \ Terminal Server \ RCM \ Grace Period entries in the registry