I have been in touch with them over some issues I have had,and the support is fantastic. I had an issue with mosh over my local network (SSH worked,mosh did not) and got a very detailed reply about why they treated LAN UDP packets that way, and why I was probably not affected since I ran a modern Linux distro and of course the setting that turned that safety feature off.
And, if you do t trust them to make such decisions for you (or you run an unsupported OS) they have regular openVPN files