2017.3 install. Between messages below, I re-downloaded the PU and rebooted my computer. Result was a successful update (fwiw, I have DSD's Premium DFDM as the only enhancement in my installation). I opened a case with Sage. Worked w/ Carmen Cruz, who will investigate error #1, but isn't concerned about message 2. By the way, the path to the files referenced in message 2 is not accurate. They actually are found in \MAS90\Home\Lib\_Obj. So far, my 2017 is working fine.