Alarm Clock Pro

Tried a free version and liked it so much that I bought the app. Great features and love to be able to wake up to "my" music. Worked fine until the latest update. Now the application will not open and returns to the home screen. Have e-mailed developer 3 times and no reply. I really would lkike to be able to use this product again - is there a way to revert to a previous version? Anybody else having this probelm? I have an older I-Pod 64 running OS 6.1.6.

UstCuz about Alarm Clock Pro, v1.13.1