The content of the lessons of the course you have already accessed can be downloaded. There are four types of download:
Click on the "Download" tab to access directly the PDF files download page. Optionally you can move the mouse over the "Download" tab and click on the first entry of the drop-down menu which is displayed after this. Using this drop-down menu you can also access the audio, video and artwork pages.
On each download page the downloads are grouped by lesson on the left page. On the right page you will see a link to download the whole content (e.g. all audio files) which will only be available when you finish the whole course.