Knowledge Base Article I can’t open my course, what’s wrong? You must have Adobe Acrobat file format to open .PDF files and it must be a current version. You can download it free. If a link does not work, try downloading directly from the server at www.amesbible.org/courses/ Due to the fact that students from other countries have problems downloading the .PDF files, we have added .html files. The format is not as appealing as the .PDF files, however they are functional.