I purchased the pdf download files but after downloading it, when I try to open the pdf file on my desktop I get this message: "Adobe reader could not open the PDF because it is either not supported file type or because the file has been damaged (for example it was sent as an email attachment & wasn't correctly decoded). "


You had a slow or bad internet connection when you downloaded the file, and so the lesson was not opened properly. Try again when you have a better internet connection.