I see that Acronis used Acrobat 6 to create the PDF. That's OK, but the PDF should have been created using PDF compatible with earlier versions of Acrobat. This can be done with an option in Acrobat Distiller. So, unless there is a need to use some feature of Acrobat 6, not in earlier versions, and I doubt that there is such a need, PDF should be created to be compatible with the lowest version possible. The reason for this is that folkes having a FULL Acrobat version earlier than version 6 might not be able to run the Acrobat 6 Reader. This has been a known problem ever since Acrobat 6 was released.