I was able to clean the registry by searching for all files that contained, "zoo", "zt2", and "africa" and then deleting those that i felt were related to zoo tycoon.
This is a huge problem for the franchise. Instead of fixing the bugs in the previous expansions, they churn out new expansions that are also bug ridden. When the game can't even install properly it shows that they didn't really use the beta correctly. I know this was a problem with the beta - and it wasn't rectified. I would think the proper installation of the game would be something that was solved before even the beta was released. This is a horrible example of releasing a game long before it was ready.
With that tirade off my chest, it looks like it wasn't all bad - once I spent 8 hours trying to get the game installed, I noticed that the gigantic animals bug was fixed, and it seems they did make it so that guests no longer got into exhibits (so far).
Some things that were discussed in the beta that weren't rectified are as follows:
1. Tank fences on all animals, not just marine ones: Now they got rid of the tank fences for the zookeeper recommendations on animals that should be able to use them in hybrid exhibits like Hippos, Polar Bears, Emperor Penguins, etc.
2. The ordering of animals in the checklist. This wasn't fixed at all... animals were previously order alphabetically with the females, males, young females and males displayed in that order. Now there are discrepencies and it's annoying when you are trying to thin out a species and they're not all together.
3. Game lags - It's even worse than before.
I don't intend for this to be offensive or bashing Blue Fang, but this is really unacceptable. Blue Fang, stop what you're doing now and make a fix all bug. Do whatever it takes to make this series a success - it has so much promise, but hasn't taken off because of the problems with it.