There are two ways to get the Premium version on your Android device. Both involve first downloading the Free (formerly called Standard) version. Once this version is installed, you can do an in-app purchase to purchase the premium features either as a package or one by one. Or you can purchase the Premium Key which “unlocks” all the premium features.
Note: If you purchase the Premium Key, you will see two Documents To Go icons installed on your device. This is normal, and both must remain installed for the Premium features to work. But if you choose, you can hide the key by doing the following:
1. Press the Menu button on the Documents To Go home screen
2. Press the Settings button
3. Press the Advanced Options button
4. Check “Hide Premium Key.” This will hide the icon for the key, yet still keep the key installed, which is necessary to use all the premium features.