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You should first download the newest version. The one in the Ubuntu repo's is old.

Download version 4.2.1 from here:

http://www.playonmac.com/en/download.html

You might have to hit "Refresh" on the install page to bring the list up. Also, you can search in the search bar in PlayOnLinux, and search for the name of a game. If you click on any of the categories, it will bring up all scripts in that category. If not, then hit Refresh and see if that works.