Adobe Photoshop Lightroom4 will not install on my Mac. "Error can not open file" when trying to open will installer. If I cannot get it to work I would like to return product.
What version of Mac OS are you using? What is the exact name of the file which you are double clicking on? If you right click on the file and select Get Info what does it state under the Open With section?
I have a MacBook Pro A1260. The file name is: Adobe Photoshop Lighroom 4.pkg. It says Open with Installer (default).
If you go to the Apple Menu>About This Mac it should tell you the version of Mac OS there.
Mac OS X version 10.5.8