Access to PDM Vault without license

I would like to grant my manager access to our PDM Vault so he can access the PDF outputs of drawings. Is there a way to provide this capability without purchasing another license of Solidworks? I am trying to use Explorer (which is free) to do this.

Here is an error message when I try to enable the PDMWorkroup add-in to his copy of Explorer:

SolidworksWorkgroup Pdm