Hi Henry,
Not sure what you mean byHenry Jones wrote:
I can't seem to find the file I need to select to install the new Hybrid template onto my Joomla admin area.
as the template is for the front end of the site and doesn't affect the backend.
If your site already has content and the Gantry component then you need the Standalone version. You can see the details here -
www.rockettheme.com/joomla-downloads/club/1688-hybrid
If you need further clarification after reading the details at the link above then please let me know.
Hope this helps.