If you will be without an Internet connection only temporarily, a good option would be downloading the videos on eJOY English app so that you can watch and study them while you're offline!
Here's how to do it :
1. Go to eJOY English App
2. Find the video you want to download and tap on it
3. Tap Save icon
Note: With a PRO account, you can save videos to study offline. If your account is Basic, you can upgrade to PRO to study unlimited.