Cinemagraph Pro for iOS is sold exclusively on the App Store. If you purchased Cinemagraph Pro for iOS on the App Store, your license will be connected to the Apple ID associated with the purchase. As long as you're signed in to your iOS device with the Apple ID associated with the purchase, you should have access to the licensed software.
If you're having trouble removing the watermark from your licensed copy of Cinemagraph Pro for iOS, select Restore Purchase under the Account tab to connect to the App Store.
If you're unable to connect to the App Store, check out Unable to Remove Watermark from App Purchased on App Store to learn how to troubleshoot.
If your Cinemagraph Pro for iOS license is associated with a different Apple ID, sign out of your current Apple account in your Settings. Go to Apple ID, iCloud, iTunes & App Store settings and select iTunes & App Stores. Tap on the Apple ID and select Sign Out. Sign in with the Apple ID associated with your Cinemagraph Pro for iOS license to remove the watermark from the app.