How to go back to a newer version of minecraft?

It sounds really weird I know, but to run a certain mod it said I had to run minecraft 1.7.2 at least once. So I figured out how to do it, but now I want to go back to 1.7.4. How do I do it? Am I blind to the version list or something? Lol please answer!

Cat

Here it is*
http://www.techspot.com/downloads/5235-minecraft.html

William