I have today Car Crash - Html5 game and mobile - CodeCanyon Item for Sale
Car Crash - Html5 game and mobile was purchased, but it is not uploading in WordPress, please told how to upload it in WordPress, and how to use it.
You can check the install instructions on the documentation included in the downloaded package.
This item is not related to WordPress. By being an HTML item, you need to manually create a folder in your server and unzip it.
There is zero guaranteeor way of knowing if embedding something which is not intended for WordPress will work.
The altenrative is to hire a freelancer to help debug it and try to find the best solution. www.studio.envato.com