How to Allow/Disallow Download of Course Materials
Step 1. Go to My Courses and click on "Edit Settings".
Step 2. In the Security & Settings tab click on under Download Setting, select "Do not allow".
Step 3. Similarly, select "Allow all" to enable download of all the externally uploaded content in your course.
Step 4. To enable download of only selected PDFs & documents, choose the third option "Selected pages only" and click on Manage downloads.
Step 5. Now, you can select the documents you want to be downloadable. Check the boxes and click on Save, to enable download of the specific documents.