How do I download Knowhow?

I am interested in trying out knowhow but don’t understand
where you download it?

It says its available for Engish versions of Illustrator CS3
(which I have) but I don’t see anywhere to download the actual
Knowhow program.

It has an area to download Illustrator CS3 to try
knowhow…..but what if you already have Illustrator CS3?

I did the little interactive demo thing but is there not a
full Knowhow program available for trial for current English CS3
users?

Thanks for your help