For mobile device users, we suggest downloading the files to your computer first, unzipping the files, and then transferring them to your device. 

You can also use an app like WinZip or iZip for Apple devices or WinZip or AndroZip for Android devices to unzip the zip folders directly on your device. 

Also, make sure you have programs available on your device to open PDF, HTML, and MP4 video files.