If we have permission from the owner of the notes to allow download/print licences then the option will be available in the licence drop down menu on the product page. 

If the download option is not available, is there a way I can still download them?

If the option to download the notes is not available, it means that the owner of the notes has asked that their work be protected - but don't worry you will still have full access to your purchases and will be able to view them in full UHD quality.