First: copy text of attached pdf file and save as rdpwrap.ini using notepad and replace with rdpwrap file inside C:\Program Files\RDP Wrapper.
You may Downlaod rdpwrap.zip file and extract and replace with file inside C:\Program Files\RDP Wrapper.
Second: Run gpedit.msc, then choose Computer Configuration -> Administrative Templates -> Windows Components ->Remote Desktop Services ->Remote Desktop Session Host -> Connections-> Limit number of connections, set conecctions to numbers of conection you want or 999999 and restart computer