How to put download file in product information

hi , my product need to download the catalog,i have upload my catalog in ( catalog -- Downloads ) , and i use this download item for my product,when i open this produce ,just can see the information and picture and ... , but no have any key for download this file , i want to know how can when my product show ,i can download the file in the same time

i mean same like this link , just wanna to have download link when show the product detail :

http://www.opencart.com/index.php?route ... ion_id=937

under the detail ,have some place for download file

Hi anastamir:

You can write the link to the document to download in the description product section...

I also have a module in my signature that helps out with your request (PDF Datasheet).

Hilde