Add a new file doesn't work

[modellismo-latina]

I'm using version 1.6.013 of Prestashop. I purchased a module consists of five banners. The first I will be downloaded automatically by logging on Prestashop Addons, but when I try to download the other 4 by clicking on ADD A NEW FORM I screen appears with SEARCH MARKET PrestaShop and I do not appear, as expected, the screen with ADD A NEW FILE. In conclusion, the four zip files are present on my computer, but I do not know how to incorporate them into active modules

Someone more practical than me can help me?