yeah, i also got the error "this widget is not registered" even i created new license code and on my licenses it shows "registered" to my development host.

installing rms was easy. you need to download jre if you wanna run it on linux. then you got to add your domain name to access.dat and edit the red5.web.properties in webapps/chat/WEB-INF/
webapps/im/WEB-INF/
webapps/board/WEB-INF/
webapps/video/WEB-INF/
to your rms ip adress.

then run ray.sh to see what rms does see more or run_daemon to run rms in the background.

at least rms 3.0 i've had running like that

cheers