I was able to fix my issue by removing and reinstalling Lacerte DMS PDF printer drivers - both the DMS PDF Printer (which I found was missing from my list of available printers) and also Lacerte Tax PDF 4.0 drivers.  After removing them I reinstalled them by navigating into the Lacerte program and finding C:\Lacerte\2019tax\lacertepdf_450_tool.exe.  Right click that, choose "run as administrator" and wait for the program to run (about a minute). When it's done its thing, press any key to continue.