We installed 2016.3 a month or so back. We were instructed to update to SU4 at minimum. We attempted to install SU4 immediately following our upgrade from 9.6SP3 to 2016.3 following what we found in How to download and install Service Updates (SU)
This simply sat at "Installing Service Update". We gave it an hour and nothing was happening. We scrapped the install and dealt with the shortcomings of 2016.3. Fast forward to this evening.... We find ourselves trying install SU5 and in the same position. SU5 has been sitting at "Installing Service Update" for over an hour with no sign in the logs that anything has happened since setup.exe was launched.
Has anyone seen anything like this before?