You're very welcome! If you're having any trouble getting any of the official downloads, try visiting:
http://gamewaredevelopment.com/downloads/
It looks absolutely hideous, but they've switched from the .co.uk domain and also have a lot of broken links on the current site. I'm sure any questions can be answered if you're not sure what certain downloads are! I'm actually not entirely sure about all of them, though it should be pretty easy to find the main ones you're looking for.
The GOG.com versions are all completely up-to-date in terms of updates. No need to download those: Hurray!
One entirely random note about Creatures 1: The GOG.com version is missing the Emergency Kit, so far as I've heard. There are ways to work around creating new worlds and adding new Norns to the world, though, so it's not really much of a loss. Just thought I would mention it, as it's somewhat related to this line of questions.
Hopefully this rambling helps you out a bit! Any other questions you might have are most welcome, though!