The download alloy pointed out is the stuff that COMES with ZTCC (for ZT1). If you already
have CC then you already have the stuff in the download; if you
don't have the complete collection, than you can download those in order to have the stuff that comes with CC. Now, this is all for ZT1...
For ZT2, Zookeeper Collection contains ZT2, Endangered Species, and African Adventures. I do not know if it also comes with Dino Danger or not; but you can read Steve's announcement and discussion about it
here