We release all the designs in a the following format

Templatename_template_package.zip

Before installing the theme via Joomla you will need to unzip the package on your PC and inside you will find the following

1. Template.zip files for Joomla 1.0 and 1.5 which can be installed directly via Joomla.
2. Photoshop PSD file so you can edit design if required.
3. Installation guide which covers the installation of the Joomla template plus setup of the module positions for Virtuemart.