3D FlipBook - Can not instal the product

The error i receive is Fatal error: Cannot redeclare iberezansky\fb3d\define_tables_names() (previously declared in /home/happysch/catalog.happyschool.ro/wp-content/plugins/interactive-3d-flipbook-powered-physics-engine/index.php:32) in /home/happysch/catalog.happyschool.ro/wp-content/plugins/3d-flip-book/index.php on line 32

Remove the light version. Extract the paid archive and install the archive from the 'dist' catalog in the extracted folder.

have read this: "Remove the light version. Extract the paid archive and install the archive from the 'dist' catalog in the extracted folder." a hundred times and do not know what it means. Please explain on a novice level what to do from after download.

Ok. Paid archive is archive that you download from gumroad by link in your purchase email.

After hundreds the same questions i removed dist catalog from the paid archive and put installation zip 3d-flip-book.zip inside root of the paid archive and named the paid archive "3D FlipBook - instalator, sources, docs.zip" in hope to decrease the same questions. Also there is "readme.txt" file to help you. But result is still the same(