Animator uses the FFmpeg executable with parameters on the command line. This is why, at least on Windows, you get a transient black window. I don't know for Mac.
You need the Extension and the latest Fredo Lib both to be installed.
Then you need to restart SketchUp completely, to ensure everything is properly synced.
Also read the Extension's usage guidance - to make sure you understand how its menu is accessed, and also any Toolbar details etc...