I am in the process of trying to re-import this set so that it will work with the latest Parkitect build. I am using the new Parkitect Mod tools so that this can be put on Steam. This is a slow and time consuming process, as I have to import each model one at a time. And unfortunately, it doesn't appear that the new imported set will be compatible with the old set, so even after I get this to work, the pieces still won't show up in any parks using this set before Beta 3. All the objects have the exact same model name and in-game name, and yet, the game considers them completely different objects.
If anyone knows if custom sets imported with the new tools should still work with parks built before Beta 4, let me know. Maybe I am doing something wrong.