I'm having trouble installing 4.4 due to error, "invalid checksum"

I have a new iMac, but same problem was happening on my macbook.  Every time I try to install 4.4, I get this error.  I even unselected validate checksums in disk utilities, still failed to install.
this file is referenced with the "invalid checksum" error.....Lightroom_4_LS11_mac_4_4(2).dmg
Thanks for any help you can provide.
Chris

Download it again.

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