Trying to get Lightroom 4 working for first time. Have now installed versions 4.1 and 4.3. Input Serial Number. Installation seemed to go perfect with both. However I immediately get error message "Error occured when attempting to change Modules". Whatever I try with Lightroom keep getting this error and thus can't use program. Macbook pro running OS X 10.8.3. Please Help. Thank You. Denny
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