Once you start the setup process, you can get the .MSI from your %TEMP% directory. It will be named as a random string (ex. b21b21.msi).
If you try to silent install with msiexec, it will work until the end. After that, a custom action is going to ask you to enter a ZIP code and click OK. To get around this, I edited it with Ocra and deleted the "LaunchDisplay" action from the "CustomAction" table. After that, it worked like a charm. I renamed the .MSI to something more human-readable and ran this command line: