Joomla! Template AT Rocket - Item Support

Where can I see the admin side screen shots of a template before buying?
Are all extensions included with template down load, I want to change an existing site to this template so I do not want to do a quick start and wipe out everything. I can work thorough the content , module names , etc. and keep most of it.
Quick Start packages will delete all content from what I have experienced. What if I want to change an existing site to your template and all extensions? Is that possible or must I start a new site to use this template?
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Item Name:
AT Rocket
$29.00 $21.75
Regular License
This item may be used for a single domain only.
$39.00 $29.25
Extended License