Under the app's menu, tap on Settings and then tap Offline Dictionary to on. Then it will start downloading the offline file. You will initially need a strong Internet connection for this.
Please prevent the phone from sleeping while it is downloading the offline database file.
Our mobile team said to make sure you do the following:
• Update your device to the latest supported OS.
• Update to the latest version of the app.
• Make sure you have a stable internet connection.
• Try reinstalling the app.
If you cannot download it after this, the issue may be with your phone or network as many of our customers around the world are able to download it successfully. In some cases it may take more than a few tries. Also, make sure that you have enough space on your phone. The thesaurus and definitions are only available offline. Audio pronunciation is not available offline.