Problem

When trying to silently install an MFE 3.1 WrapPack, the following error message was displayed:

This patch package could not be opened contact application vendor to verify this is a valid windows installer patch

Solution

The user was entering an invalid msi silent install command. Using the following command (as instructed in the websync readme) allowed the WrapPack to be installed without errors:

start /wait msiexec.exe /update WrapPack.msp /qn /l*vx patchinstall.log