can someone assist me on that or why am i getting that error after installation?
It happens when it’s not a WordPress theme or the stylesheet file is corrupted. Contact with the author of that item to get support. Only they can provide you the best assistance. Hope, you will get your solution fast. Cheers.
contact with that item author with purchase key hope solved your problem.
This error occurs when the file you are trying to upload into WordPress is not a valid theme file. Please go back to your downloads page and download the theme again, making sure to select “Installable WordPress file only.”
If you don’t see this option, then you may have purchased an item which is not compatible with WordPress. I would suggest contacting the author of the item you purchased to see if they offer a WordPress version and can help you exchange it.
Hope this helps!