I'm sorry to hear that - please add some more information about the messages you get from the application.
Please also add information about if you try to install it from the App Store directly on the iPad or iTunes.
I tried to download from App Store directly to iPad2. I and I have an icon on the desk top but it is greyed out. When I go back to the install page the box saya "installing" but that is also greyed out. Pushing the U[date button brings up a message "Photoshop TOUCH CANNOT BE INSTALLED AT THIS TIME.RETRY' how ever many time I retry I get the same message. Harry2320468