Opencart Invalid file type!

Hi I am Using Opencart Version | I Bought This Theme Revo - Drag & Drop Multipurpose OpenCart 3 & 2.3 Theme with 15 Layouts Ready in 51 Dollars But when I Tried to Install It, It Says Invalid file type!
Please Help

Please check your purchased theme Documentation, hope you will get proper help how to install the theme there. If you have still problem with the theme then The best way to get the support is Contact your purchased Theme Author. Contact Author and let them know. Thanks