The App Store and Google Play classify Mobile Learn as a paid app because of the in-app purchase mechanism. This remains true even if your school has purchased an institutional license. As a result, in order to download Mobile Learn you will need to be in a country where Google Play or the App Store permit downloads of paid apps.
Follow these links to find out if the App Store or Google Play permit downloads for paid apps in your country. If the App Store or Google Play will not allow downloads of paid apps in your country, you will be unable to access Mobile Learn.