Coax Copter 3.4 Firmware Generation?

Does anybody know of a way to get latest Copter 3.4 firmware generated for a coax copter? Coax copter is still not an option in mission planner and the dropbox links I had found under other topics (Coax Copter Support) have gone dead. Just wondering if there is a convenient way to get this firmware?

Thanks in advance

JN