Your immediate problem may be partially solved by the following technical support link from their web site:
AirNav Techncal Support .
Only access to expired ERC, VNC and VTC are supposed to be blocked, not access to the software completely. The link above is supposed to be a procedure to fix the bug.
Let's hope this is a temporary problem and they soon get their act together. I get the feeling they're a small operation. Maybe the owner plus one support staff. A single resignation could make a huge difference, especially if the owner also has a day job.