Downloading and installing custom Joomla! templates was always an easy task. But editing the existing templates have always been an adventure and has forced
many Joomla lovers to hire developers to edit their templates. This mostly comes from lack of experience with new code and especially CSS.
To help you out and let you CSS away without fear that you will brake something , we added new feature to YJSG that will activate an empty CSS file after all CSS files load. You can use custom.css file to apply any template changes you might need or simply test your CSS skills.
For manual update please visit this thread.