More MAC help :)

I have OSX 10.0 and it seems as though nothing I download works unless I have 10.1. I searched APPLE and they said 10.1 is not available for download. What does that mean? Does it mean I have to buy OSX again?
Bottom line, 10.0 is very buggy, slow, and lots of stuff doesn't run on it. Definately go pick up a copy of 10.2



