I guess you are confused, @javasabr provide a fork of the project, with its own feature, build, and way to install.
@Empire_Phoenix, me and some others work on the project "JME3-JFX" hosted at https://github.com/empirephoenix/JME3-JFX.
you should be able to use JME3-JFX "original" into your maven project with :
- No need to download the jar
- This version was compiled with jme 3.1-beta1
PS: I also have my own fork, but for experiment, personnal use.
EDIT you could try to use the range version of maven (not tested personnaly):
For jme 3.0 user:
For jme 3.1 user: