Help with adding related products

[ricangem]

I currently have: Zen Cart 1.3.9b

Hi, I would like to add related products to the items in my store and I don't know if I would have to download cross-sell or multi cross sale? Also, what would I have to do once the program is downloaded? Would I have to unzip the files and how would I do so? Im sorry, unfortunatley I am running the store on my own and I have no one to help me. It would be great if someone would explain to me exactly what program I would have to download and what I would have to do once the program is downloaded. Hopefully this will help someone else that may be having the same problem. Thank you in advance

[swguy]

Please don't double post your question.
Follow ups to http://www.zen-cart.com/forum/showthread.php?t=176796