Your Guide to Using the Interstellar Template for Joomla
No, Interstellar is only compatible with Joomla 3.4+.
Gantry is, as a basic definition, a framework used for assembling, building and maintaining a RocketTheme template. It is an advanced platform for dramatically extending the capabilities of the entire theming system of Joomla.
No. RocketLauncher will install both Joomla and the demo sample content and images, so you will need a fresh Joomla! installation.
To avoid image license copyright issues, all sample content images shown in our demo site will be replaced with blank versions in the RocketLauncher version.
This is a very simple fix caused by a conflict between your style settings and the
demo.css file which is loaded through the Custom CSS/JS atom found in the Page Settings tab within the Gantry 5 Administrator. This demo file is intended to make the RocketLauncher match the demo as much as possible, giving it its unique styling. However, removing this file enables you to replace these elements.
Simply navigate to this tab, scroll down to the Atoms section, and select the Custom CSS / JS atom. From here, you can locate and remove the Demo CSS item. Once this is done, save your page settings and refresh. Your changes should now appear on the front end.