If you wish to deploy the app from your Google Admin console, you can find those instructions here.
1. Visit https://apps.google.com/marketplace
2. Search for Fluency Tutor
3. Click Install App on the Fluency Tutor for Google app
4. The Get ready to install dialog will appear. Click Continue
5. At this stage there are two different screens which will appear:
For admins: They will receive a special permissions screen - asking them to accept permissions for users and also which domain they want to deploy to
For regular users: They will receive the regular Fluency Tutor permissions popup
Confirmation will be shown that the app is installed.
For admins: They will receive an additional screen, which will allow them to send a notification to all users on the domain that the app has been installed