You can test for free (no question asked) for 30 days, this add-on with the 2 main repositories needed (jfrog plugins, jfrog libs), using Artifactory Online.
How to build FishSim
If you are not using Artifactory like in the screencast, you can activate the profile "jfrog" to access the repo.jfrog.org needed resources. So, to build running "mvn -Pjfrog install" should work.