I'm seeing a strange issue where it looks like I can't cancel an 
installation during the last action before InstallFinalize in the 
InstallExecuteSequence.

I have two deferred custom actions for updating VS 2008 and 2010 
(running "devenv /setup /nosetupvstemplates") and they are scheduled 
immediately before InstallFinalize.

When I see the progress text for the 2008 action I cancel the 
installation.  The 2008 action takes some time to run so the installer 
continues to show this text for a bit until it eventually rolls back and 
aborts the installation.  If I do the same thing during the 2010 setup, 
(which comes after the 2008 action and is the last thing before 
InstallFinalize) then the cancel dialog still shows as normal, but this 
time the installer will run to completion.

I re-ran the installer and opted not to install the 2010 support, so the 
2010 action won't run.  This time when I cancel during the 2008 action, 
the installer waits for the 2008 action to complete but this time the 
installation completes instead of rolling back.

Does anyone have any insight into what's going on?

Thanks,
Rob


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