Lewc, there was a problem with the App with alarms with HD and HD+ (something related to Android 4.0 changes). So we have removed it from the store for HD and HD+.
At some point we'll add the HD/HD+ version back. The developer who did the app isn't with us anymore, so unfortunately it isn't a quickfix thing.
If you send me a private message with your email I'll email you when the app is available for HD and HD+ again.