Useless

I purchased Ultimate Nikon handbook via this app. Later following an update alert, I updated and since then their store displays "No Products Found" message and when I tried to access my purchased copy, their Library is empty. Following the advise from their customer service, I deleted and reinstalled the app, and tried to restore my purchase. It was of NO USE and still I face this issue, without any response from the seller of this app.
Useless app and worst service ever from a seller through App Store.

NextEye about N-Photo