I was trying to install a web app that another team member built. this failed with the message: “The installer was interrupted before <MyApp> could be installed. You need to restart the installer to try again.” Trying again is (obviously) meaningless, it will just fail over and over. And the error message is very general, something failed. In the eventlog we can find this error: Installation success or error status: 1603 If we run the installer again but with verbose logging: msiexec /i MyInstaller.msi...