What we have available is the ability to download all the resource files for a module in a single zip file. This option is available at the bottom of the resources section in each module. However, the files are not in a single PDF document - they are in individual files.
If you would like to print out all the PDF documents it is possible to print many PDFs in a single go. Here's an article that describes an easy method in Windows, but there are other methods as well such as by using Adobe batch printing. http://smallbusiness.chron.com/print-multiple-pdf-files-opening-one-56690.html