What programs can I use to use these fabulous graphics?

I am a customer of the theme genre, but I get emails every week about graphic packages - some of these are free to try, and I’d like to try them. They have facebook ad packages in them, they have fonts, and wallpapers, and other graphic art pieces. I am a mac user and creatively use Pixelmator for my work at home… Can I use pixelmator and create projects, ads, from these graphic files? What is the appropriate software with the free downloads that are mailed out each week from Envato elements? Anyone?

Dear Envato Team
Today I purchased from your web site profile company template but I not understand how these files works which file I should open it , are there especial software need to install in PC could you guide me to open it step by step