I've already spent some time searching on web how to figure this out, but i couldn't.
Does someone knows how to capture when an embedded installation error happens
I need to do something like a rollback when any error occurs.
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You mean `ResultCode` from [Exec function](http://www.jrsoftware.org/ishelp/index.php?topic=isxfunc_exec)? You may check [this question's answers](http://stackoverflow.com/questions/6345920/inno-setup-how-to-abort-terminate-setup-during-install) – RobeN Jan 16 '14 at 11:43