Why do I get the error saying my session has timed out and to start the operation again from the beginning when trying to instal lion

I've purchased Lion from the app store and successfully installed it on three computers...however, now I'm receiving an error saying my session has timed out and to start the operation from the beginning???  Help..Thanks

This is asked and answered mnay times every day.  The forum search abr is on the right side of this page.
Disable your firewall/security software.

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