The PDF Catalog Module version 2.0 is a major version and therefore cannot be an upgrade of a previous version, but a clean installation is required.
You can then install this module version 2.0 following the steps explained in our article.
A direct link will be added as a sub-tab of the Modules tab.
IMPORTANT before installing the updated version:
For more information on the PDF Catalog Module, please refer to our online documentation.