Zoo Tycoon 2 Ultimate Collection graphic renderer problem

Hello guys
Im new here in the foruns but I always download your stuff, especially the sims games, cause they work just fine.
But im getting a problem and i cant solve it. I downloaded the Zoo Tycoon 2 Ultimate Collection, I was able to install it bypassing the installation problem but when i start the game I get and error saying "Zoo Tycoon 2 was unable to create a graphics renderer. Please contact your graphics adaptor vendor to make sure you have the latest driver". 


My specs are: Windows 8.1; Intel Core i7-4510U @ 2.00GHz 2.60 GHz; 4 GB RAM; Nvidia GeForce 820M

My other games are running just fine; i don't think that its a graphic card problem because i already unistall it and reinstall it and the problem presist. The graphic driver is up to date too. I dont know what to do. I try to download a Zoo Tycoon 2 solo game and the game worked (well the guest view was bugged, i walked under the floor), so I dont think its a graphic card problem. I reinstall the game in compatibility mode too.

Thank you for your attention! Hope you can help me solve this problem!

Well I just solve it.. apparently you just have to change zt.exe on crack folder to zt2.exe and do the substitution .. that worked..
Thanks anyway!

what's the substitution..?