In fact, i'm comparing different installer here, Qt Installer is not the only 
option i consider.
I see same behavior in an INNO Setup, however MSI behaves different - it 
doesn't allow to install program twice.

Иван Комиссаров

29.01.2013, в 13:21, Kalinowski Maurice <maurice.kalinow...@digia.com> 
написал(а):
> 
> I remember that this has been under discussion once. One question would be 
> how other solutions (NSIS, ...) handle this. IIRC they behave the same and 
> simply overwrite the current setup. This is most likely based on the 
> assumption that a user knows what is installed on his/her machine.
> 
> BR,
> Maurice
> 
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