The Quickstart package is a Joomla demo package which is a full Joomla installation including Joomla Template from WarpTheme, 3rd extensions and the corresponding theme demo content. This is great if you don't want to start from scratch or if you would like to have a peek at how everything is put together.
Quick start package is a full Joomla installation package, It's strictly for use with a new Joomla installation to provide you with a duplicate of our demo for that particular template. It's cannot be installed into an existing Joomla site.
We are using Akeeba component to generate a Joomla Quickstart package. You have to install the quick start package just like a typical Joomla installation process.
Browse the Account Dashboard and download one of the Joomla quick start packages NAME_demo_package_j4.zip. Unzip it to your web server directory. Now just follow the regular Akeeba installation instructions: