If you want to edit design of our templates, you will find PSD file very useful.
PSD is the file created in Adobe Photoshop during design process of each template. This file is similar to ordinary JPEG or PNG image, but it's editable.
To download a PSD file from Jupiter X templates and start editing a theme template on PSD, you first need to have your Jupiter X theme registered. You can learn how to register your theme in this article.
After that, you can simply go to the WordPress left menu, then go to Jupiter X > Control Panel > Templates and download the desired PSD file.