Drop the entire zip in your johnny 5 folder and extract to it.  
Don't extract to "johnny 5\cdat pack" extract to "johnny 5\".
If you are confused, many zip programs have the "extract here" option when
you right-click on the file, which will get the job done automatically.

To access the info for a game use the pre-defined "toggle key" in the viewer.  If data doesn't come up then there isn't an entry for that game.