The last version is from 2016. Maybe, you can get help from http://webchat.freenode.net/?randomnick=1&channels=rxvt-unicode&prompt=1 (or *irc.freenode.org*, channel #rxvt-unicode <http://webchat.freenode.net/?randomnick=1&channels=rxvt-unicode&prompt=1> ) or the maintainer thierry at FreeBSD.org