To sideload Vivi Display onto a Promethean Panel, please follow these steps.
Copy the Vivi Anywhere APK file over to a portable USB storage device
Plug the portable USB storage device into the USB port of your Promethean Panel
On the Promethean Panel, navigate to Applications > Files and locate the portable USB storage device
Double tap on the Vivi Anywhere APK and you will be prompted to install the application
You will then be prompted that the file has be installed correctly
Once installed, locate the Vivi Anywhere app in you applications menu and double tap to launch it