It mainly depends on your plugin extension definition in term of plugins minimum version required:
(as illustrated in this thread)
It would be best to build that extension plugin in RTC3, and then try to deploy it on a RTC4 server.
Question
I have developed a rtc extension plugin using rtc server version 4.0.
Is it possible to deploy this plugin in RTC server version 3.0.13?
Solution
It mainly depends on your plugin extension definition in term of plugins minimum version required:
(as illustrated in this thread)
It would be best to build that extension plugin in RTC3, and then try to deploy it on a RTC4 server.