How do I download this? I've seen it used before and I really want to use it myself and be able to access it whenever I want.
You couldn't download the software because there is no website to acquire it from. I've tested all the available links and it appears they point to the same website that is now discontinued making it impossible to obtain the software.
Alternatively, you can try Game Maker to see if it suits your needs: http://www.yoyogames.com/gamemaker