At the top of the present page, you see the image of the bass guitar?
At the right of the image of the bass guitar, you see a link called "Product". I drives you directly to the webpage of the product (it works the same way for about 95% of the products presents in KVR).
And for this bass guitar, at the top left of the webpage you'll immediately find the download links.
If you want to see all his other products (you're right, they are very simple but they sound very good!) at the top of his webpage you have a menu in blue characters, with "Software" among the commands of the menu. You can browse among his softwares by this way. Some are payware but many are freeware. They all have a very good sound, very few tweakable but very good as they are. George Yohng is an excellent developer in physically modelled synthesis. By the way you could take a look at his articles too...