Looks like there is a new version of PDFCreator available -- we've been getting the error for around or just over a week.
PDFCreator 3.2.0 1/17/2019 9:41:45 AM 32.03MB Updates Moderate
Digest of the downloaded update doesn't match the digest from the catalog: [VF5KMrtWpOefNUnSmfi8mwN6ENU=] vs [pa0ZJCSs6LvDE2fdPAgq9qNwbaM=]