Okay, I have a bunch of MSI apps that I only want the user to see the
"progress" bar.

BUT, if there's a problem, I want it to be able to show the entire error

It seeems if I show just progress bar and there's a problem I get the
ever helpful:

MSI 1603 error

Which means nothing.

Until I set it to "full" user interface and then I have to walk through
all the install steps.

Is there a way to do this?