Despite its high reliability, it happens that Android faces some malfunctions. These generally will be manifested by the appearance of a window on the screen, indicating the error occurred and its reference.
The application "xxx" could not be downloaded due to an error (403). If you encountered this error when downloading an application, it probably means you have an unstable Internet connection, or there is an error in the proxy settings or the settings for APN. To try to solve the problem, go to "Settings", "Mobile networks", "APN" and delete the information found in proxy and "menu" button and "save". You can also switch your phone to airplane mode and then remove it. This will allow you to reset the internet connection. You can finally go to "Settings", "Accounts", "Google" and delete the synchronized account (be sure to have the credentials to be close associate then again). Once done, restart the phone and re-sync your Google account.