Please note that you also need STUFFIT on your system to extract the PDF file.
Regardless of whether you download the PC or the MAC version, you will end up with the manual file as CAP345.PDF (close to 3.5 Meg in size) - which you can read using Adobe Acrobat (full version) or the free Acrobat Reader, which you can download by clicking here if you don't have it on your system already.