Limit only 1 rdp session

Hi everybody,

I'm asking to this forum because I'm not finding anything... (or probably I'm not able to).

As you know, the limit od rdp simultaneously connections  in windows server 2012 is limited to 2.

Now I need to limit it only to one (like a windows 10 client for example).

There is a solution that avoid to install the terminal services?

thanks in advance!