This is the guide to install theme of Prestashop 1.6 manual. I can make sure 100% success full
After you download from where you bought
Please find zip file of theme and unzip it
after unzip you will see 1 file : Config.xml and 2 folder themes + modules
2. Upload themes and module to your hosting
P/s: We hope that the tutorial is helpful for you and do not hesitate to share your idea or ask us if you have any question.