I've been completely unable to get a reliable connection to AirVPN ever since I installed Windows 10. Typically it will connect, then appear to 'freeze up', then go through a cycle of multiple disconnect/reconnects ad infinitum. I think this issue actually originated earlier with Win7 but wasn't as frequently occurring.
Sometimes it appears to work albeit erratically but as soon as I launch eMule - Bam! Data rates drop to a few 10s of bytes per second and shortly thereafter the disconnect/reconnect cycle begins.
It used to be that removing the tap driver and allowing the client to reinstall it seemed to fix the issue for that one time connection (immediately after the reinstall), but now that doesn't even work reliably.
About once in every 10 connection attempts I'll get a connection that works and stays stable.
Linux connection seems OK, my next step will be to set up a Linux VM to use in the hope of getting some use out of the service.