Tom Hogarty, the Lightroom Product Manager has weighed in on the recent issues with the 1.4 upgrade: “The Lightroom 1.4 update for Mac and Windows has been temporarily removed from the Adobe.com web site. Those Lightroom users who have installed Lightroom 1.4 should uninstall the update and install Lightroom 1.3.1.(Mac, Win) until a further update can be provided. For those not in immediate need of the updated camera support available in Camera Raw 4.4 or the DNG 4.4 Converter, it’s recommended that you also continue working with the 4.3.1 versions. (Mac, Win)” Read More .