The download button on course pages provides the opportunity to download the associated files and pages of a course with one big exception: videos are referenced only by URL. The download file has a .imscc suffix, which stands for IMS Common Cartridge format. However, it can be opened with any .zip program, such as 7-Zip or the Windows File Manager.
We are still testing it for export/import capability with LMS systems, including Moodle and Canvas. For now, you can treat it like a zipped archive and get at the resources. Remember that the Creative Commons licenses apply to appropriate use – and enjoy!