WP Cross Sell
Sale Page: hhttp://www.warriorforum.com/warrior-special-offers-forum/787556-otos-dead-new-amazon-like-plugin-turns-your-download-pages-into-upselling-money-machines.html
Product Price: $9.95
What WP Cross Sell does is it creates a related items slider to the bottom of any page you want to create it for...but specifically for your download page. On the slider itself, you will have form field box where you can place unlimited upsell offers similar to what you on Amazon. This is a Cross Sell but you can obviously manipulate this however you like for upsells, oto's, unadvertised bonuses. You name it!