Free Month Archive Needs API to Install Features

I received email with my free downloads of the month, download one of the items that interested me and now when trying to use I came across the need to have an author API to be able to install plugins, child theme etc. How can I make use of this freebie? I refer to the Dannys Restaurant Theme by HOGASH. I await directions. I only received the FREE proof of purchase.**Sincerely

No answer Yet and I need to know with high priority if I can use this theme because I have date to finish de website for my client.