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The .ztd file should be placed in the dlupdates folder. As Khaydar said, the .dll files go in the main Zoo Tycoon folder. If you keep all the items you download in the dlupdates folder, it is much easier to go in and remove the ones you don't want to use. You can leave the .dll files in the main ZT folder. If you know which files you want to take out, look in the updates folder to see if they are located there. Be sure you remove only the added user made downloads you want out. The Complete Collection content is automatically stored in that folder, and you want to be sure it remains. Generally, my game will operate with 350 added items, and this includes the CC content in updates folder, so I would recommend less than 300 in the dlupdates folder. Please let us know how things are going with this.

Here are my wild dogs & hyenas

No, dll files should go in the same folder that zoo.exe

I wanted a more traditional look for the bear enclosures . Some other work done as well

Don't use the game menu to add downloads, because it will install them with the original content, making reinstalling your game the only way to get rid of them. Instead copy paste downloads inside dlupdate, in your ZT directory.

Here's the restart

Similarly, we had to keep the great apes more closely confined but they appreciate the tall elms. They tend to avoid getting over into the valley for some reason

You can't, of course, have the carnivores roaming about loose. They're confiine to a valley near the castle