I had the same issue. 1.1.4 fixes this, but every time I launch it it tries to update itself - to 1.1.4. At least it works.
PRO DJ LINK BRIDGE Not Working
ProLink Bridge 1.13
Does not recognise CDJ3000s, DJM900nxs2 or LINK in Rekordbox
Problem began after updating from 1.10
I've got no firewall on and no other software impacting ports.
Connected via ethernet.