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To install the Virtual Print Driver silently on a new machine, Hyland Software, Inc. needs to be added as a trusted publisher. To set Hyland Software, Inc. as a trusted publisher, you must obtain the "VPDCertificate.cer" file from Hyland's Team M (as of Oct 2014). I have The "VPDCertificate.cer" for version 13 has been downloaded as of 10/2/2014 and is located in Swarchive.