Unable to update Plex Server to 1.15.4.993 on QNAP

Server Version#: 1.15.3.876
Player Version#: Version 3.97.3

I have a QNAP TV-471. I have been trying to install the latest Plex server update 4.993 and it is failing. I get a message saying it cannot install. There is no QNAP log entry recorded. This has never happened on previous updates.

Is anyone else experiencing this issue?