the installer of postgresql 9.4.1208 and 8.4-703 doesn't start - Mailing list pgsql-general

Hi there!
I am new here around, so please don't laugh at my question. 

I dowloaded the installer but if I double click on that... nothing happens :(. what am I doing wrong? I also turned off the antivirus, just in case but nothing changed. 

Any suggestion?
thank youuuu

--
Stefania 

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