PDF Drivers

There are three different PDF drivers in this list.  
Make sure you download the PDF driver relevant to your version of 
Imposition Publisher or Page Pairer:

pdf.zip    - For Imposition Publisher 4.6.3 or later, IP X
             and Page Pairer 3.3 or later
pdf460.zip - For Imposition Publisher 4.6.0 - 4.6.2
             and Page Pairer 3.2
pdf450.zip - For all previous versions of Imposition Publisher
             and Page Pairer