Having bought Limewire Pro recently Stanstinnett should have no problem connecting and downloading . Still if you deactivate the Windows firewall you must make sure your antivirus allows LWPro and if you use a router you must also open the ports on it.
As far as your antivirus software is concerned you open it see what programs are allowed and if LW does not appear in the list you add it by following the various steps given by your antivirus software.
As far as your router is concerned after checking the port number in Tools when opening LW you enter the number in your router (UDP/TCP). Normally the brickwall should disappear.