Your purchase comes with a list of files that can help you setup and use this product.
Themes and Plugins
For Themes and Plugins, you will get any of the files from the list:
This is the file you want to upload to your site. This will contain all main HTML/CSS/PHP etc files that you need to use your product.
Demo XML File
This is an XML dummy data file that gives you demo data to make your theme look as close to the demo as possible.
Photoshop Document, is the default format that Photoshop uses for saving data. These files will allow you to work with the images individual layers even after the file has been saved.
This file contains additional theme layout files that you can use to set up your theme.
For Logos, you will get any of the files from the list:
This is the file you want modify, or work on. This is the base logo/graphic file that can help you customize the purchased product as per your requirements.
An EPS file can contain text as well as graphics. It is a graphics file format used in vector-based images in Adobe Illustrator. This will help you mod use your images in the logo.
This will contain the font file of the Logo/Graphic that you have purchased. This is available in a .ttf extension.
This will contain an image file of your logo in PNG format.
This will contain an image file of your logo in JPG format.