"What's stopping you asking the user questions in the InstallUISequence &
running the DLL function in the InstallExecuteSequence as is standard
practice? Your custom action doesn't need to run immediately as soon as
you gather information from the user, you can still schedule it after
InstallFiles or whatever you feel is appropriate.

No answer to basic or quiet UI?"

The custom action populates some defaults in the dialog prior to dialog
display.  These defaults are gotten from a file that is installed and parsed
by a DLL function, right after install files.  This dialog is supposed to
allow the user to reconfigure the default values gotten from that
just-installed file.

Quiet UI - right now, it isn't allowed - the user must answer some
configuration questions, so quiet install is not an option. However, I have
coded for it in some places tho - in the hope that someday we'll remove this
restriction to configure this thing after install.


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