Uploading a Themeforest custom theme

Hi all.

I recently purchased a Themeforest website template hoping that I could upload it to Zoho sites. I have attempted to upload it in the theme menu using the upload theme link and failed. The theme does not seem to have a design.html file like the one in the tutorial. Is there any more information on this or is it even possible to upload Themeforest templates at all?

Thanks, James.