The Free Trial is a complete and working version of the Zen theme except it has a watermark on the homescreen to encourage purchase of the premium theme.
If you would like to purchase one of the premium versions you can get it Here
If you are interested in getting it customized with your own wallpaper or in any other way please email me at Custom@BBThemeDesigns.com
By the way, the reason for the theme size is 100% due to the high resolution wallpaper throughout. It will not affect the overall performance of your phone. The animation on the homescreen is flawless and if you don't believe me try the free trial for yourself. You won't be disappointed.