The Additional Resources included in the course as files are available from the app.
If you are not able to download them, please update the app to its most recent version and log in again, to make sure you can find them accordingly.
You will find that most of these resources are available in compressed folders (.zip or .rar). For this reason, to decompress these types of files you will need to have a download manager installed on your device, otherwise you will need to install a specific app for these types of files such as Winrar or Winzip. In your app store (Google Play or Apple Store) you will be able to find the best option for you.
This way, you will be able to download the Additional Resources of the course to view the PDF files directly on your device, as well as download other formats (PSD, .zip, etc.) to easily locate them in external services such as Dropbox or Google Drive.
In addition, please remember that you must have a good Internet connection (WiFi) to ensure they download correctly.