It won’t let me download it and I really want it
That iPad and iOS version do you have?
Zen Garden is currently only available for these devices: iPad Air, iPad Mini Retina, iPhone 6 and iPhone 6 Plus. Would you be seeing this error on one of these devices or is your device unlisted? In order to run Zen Garden, you would need a device that can support Metal. Only the listed devices are able to do so, at this time.
Please let me know if you have any additional questions about this issue.
Thanks and have a great day!