Hi - I have the same problem and I would love to test it - except I dont know how to. I downloaded the jar file to /usr/share/openhab2/addons (ref: Location of addons folder ) and OpenHAB only found the old/original binding binding-harmonyhub - 2.5.0.M2
(I also double-checked IP address in case that is an issue - my Hub is allocated fixed IP address in the network so it should not be the issue)