"Lightroom_5_LS11_mac_5_7.dmg" for Mac to update my Lightroom 5.6 (build 974614) but when I attempt to open it I get the following error message "Lightroom_5_LS11_mac_5_7.dmg can't be opened as the disk image is not recognised". I'm running Yosemite OS 10

I have downloaded "Lightroom_5_LS11_mac_5_7.dmg" for Mac to update my Lightroom 5.6 (build 974614) but when I attempt to open it I get the following error message "Lightroom_5_LS11_mac_5_7.dmg can't be opened as the disk image is not recognised". I'm running Yosemite OS 10.10 on a Macbook Pro (Retina, 13-inch, Late 2012 with 2.9 GHz Intel Core i7 processor).

Vk2mh it sounds like the download was not complete or corrupted.  Where are you downloading the update from?  Have you tried downloading again?

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