Support of files is not the responsibility of envato and should be carried out by the author of the theme. Have you spoken to them? Usually they would be willing to help install the theme (not obligated to do so) if you were having serious issues.
When you say you paid for installation - was that via the author or envatostudio? Could they not install the theme at all?
I don’t see a file named “wpresent” are you sure that is the correct name?
What exactly is the issue you are having? What errors are being given? Is it not installing at all or just not look like the demos etc?