I used the one that is linked on the top of the huge refactoring / security post … which is labeled “2.1.0-SNAPSHOT” and dated 2017-04-23 :
http://www.cd-jackson.com/downloads/openhab2/org.openhab.binding.zwave-2.1.0-SNAPSHOT.jar
A few posts in there is @ptmuldoon 's 10 step instruction … I followed those and had to be extremely patient after step 10 … initially most devices showed up as unknown.