As an alternative to using the “Rollback” or “InstallException” approach, simply use pinvoke/interop to call the cancel button on the base installer form directly. (see my related post for more detail and full code) References https://ronniediaz.com/2011/06/20/the-savedstate-dictionary-does-not-contain-the-expected-values-and-might-have-been-corrupted/ Continue reading