this is frustrating I have tried for hours to install the theme but it is impossible, please l need my money back
Have you read the documentation with the theme? Are you sure it is WP and not the HTML? Have you tried to email the author of the theme?
You will only be entitled to a refund if the theme does not work as advertised or is genuinely faulty. To report this you need to email Envato support. BUT be aware it is rare that a file is broken to the point it will not even install.
Read the documentation, disable all the plugins and contact the author. In most cases it’s the users side that’s causing the problem. The Envato wouldn’t approve broken item. Also saying:”it’s not working”, won’t get you anywhere. You need to give the author a better feedback.