If I understand what you are looking for, you only need to pay once to use a premium e-Sword resource on both your main PC and an Android device. You will need to have the Product Key for the premium e-Sword resource available before you can download and install the resource on the second device. This is an example of how to install an already paid for resource on an Android cell phone. A KIndle may be similar:
1. Go to the BBL section.
2. Go to the menu in the top left corner
3. Go to the Download section and click on Bibles
4. Find the previously purchased resource in the list and tap on it to select.
5. Tap on the download icon in the top right corner
6. Enter your email address and Product Key associated with the previously purchased resource.
7. Hit the Validate button
8. The rest of the download and install should follow from that point
ElderB