The version of VB6 that is most often included in books for classes and such is the "Learning Edition" of VB. It's fairly close to the full version, but the main difference lies in the fact that you can't compile any programs you create. If your class is focused solely on VB programming, then I'd take a guess and say that whatever book they require you to buy will probably include the "Learning Edition" that I'm talking about. However, I do recommend buying the Pro edition if at all possible.