When my ISM setup is run on an existing installation, it goes into update mode which works.

I added a OnPatchUIAfter function which seems to add the final page to confirm it completed successfully. That's great.

However, I wanted to provide some more information like show a message or open a document. I thought I'd be able to do so in the OnPatchUIAfter function, but no matter what I put in it, it doesn't seem to run. Not even a MessageBox.

Am I supposed to use another function at the end of the update installation? Thanks for your help.