Please, read the documentation. You are installing the wrong file. You have to upload the cheope.zip archive, not the zip you downloaded from themeforest! Be sure you are installing the right file in your wordpress site.
Sure. After the purchase you can access to our suppor forum and open a new topic if you need help from our developers. In the forum you can also watch a lot of videotutorials and also download our sample data to make your site like our demo with just 2 clicks!