Can I use the course on my phone or tablet?

Yes. The MP3 audio and PDF eBooks work on any phone or tablet. The whole course is big, though (15 zip files, about 3.5 GB), so this is the easiest way:

1. Download the zip files on a computer, over Wi-Fi.
2. Open them: see How do I open the zip files?
3. Copy the folders you want to your phone or tablet, with a cable or through a cloud drive such as iCloud Drive, Google Drive or Dropbox.

You can also download straight to your phone. On an iPhone or iPad, tap a download link: the zip is saved to the Files app, in Downloads, and tapping it turns it into a folder. On Android, the file goes to Downloads: open it in Files by Google and choose Extract. Check you have enough free space and are on Wi-Fi first.

You don’t need iTunes, or to sync your phone with a computer.