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Android Application:

MOST COMMON INSTALLATION ISSUES ON ANDROID

Allow unknown sources

By default on Android devices, installation is not allowed from "unknown source", in other words from sources/sites other than the Play Store.

In order to install an app from apps.cooleriot.com, this must be allowed through the following setting on the device:
In the Settings app, depending on the device and Android version, it could be in "Security" or in "Applications" , check the box "Unknown sources".