Good day,

On our backup mail server today I was attempting to install build 9378 and we get the following error "There is a problem with this Windows installer package. A DLL required for this install to complete could not be run."

We were previously running build 9322 fine on the same system. The OS is server 2012R2. Any idea why the latest build won't install? I know that the listed supported systems are 2016+, but upgrading currently is not an option. Anyone know the DLL the installer is complaining about? The event viewer is kind of useless and doesn't tell me.