By default, Lightroom 4 installs into the Applications folder, and the application file is named "Adobe Photoshop Lightroom 4.app."
Note: It's possible that the filename doesn't display the .app extension because this option is not turned on by default in Mac OS.
If you've installed an earlier build of Lightroom 4, the release version overwrites the application file previously installed. (For example, this issue can occur when you install through the public beta program, and then install the release version of Lightroom 4. This behavior is expected, and Adobe recommends that you use the most recent version of Lightroom.
However, if you had changed the original application file by moving or renaming it, the release version installer finds and overwrites the earlier build. Two issues can occur:
- If you have moved the previously installed Adobe Photoshop Lightroom 4.app file, the release installer finds and overwrites it in its current location. The result is that Adobe Photoshop Lightroom 4.app isn't in the Applications folder.
- If you renamed the file, the modified name remains intact, and the file contents are replaced with the contents of the release version.
To keep the earlier build of Lightroom 4, do either of the following before you install the release version:
- Compress the app file. Control+click (Right-click) on Adobe Photoshop Lightroom 4.app and choose Compress Adobe Photoshop Lightroom 4.app. You can uncompress the file after installing the release version.
- Move the app file to a drive that can be unmounted. Unmount the drive, and then install the release version. Remount the drive to use the earlier build of the application.