Cannot verify Yosemite copy

Hi,
iMac 2013. I've successfully downloaded Yosemite, however when I've tried to install it, I got a message saying: "...cannot verify copy of Yosemite, download may be damaged, please download a new copy on the App Store", which I did once, and install several times.
Did anyone experienced that? ...and fix it obviously :-)
Thanks in advance.

Okay, actually installation starts and after a few secs, I get a dialog box with the here below text (translated from french...):
Impossible to verify the copy of Installer OS X Yosemite. It may have been damaged or altered while installing.
Delete this installation copy, go to the Mac App Store and download a new copy.
Snapshot might help.

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