How to download the screen recorder software Camtasia Studio!

this is my first video that records what im doing on the screen besides a video i did a long time ago on my DeMoNGiRl754 acc. but i wanted to how you how to download it and i hope you enjoy it, i feel it is alot better then the hypercam, 1 and 2. so here is the link
http:--www.techsmith.com-camtasia.asp