File Date Changer can be purchased from the Mac App Store and will be automatically installed into the Applications folder.
File Date Changer can be uninstalled simply by dragging its application icon into the Thrash.
You need to manually activate the "File Date Changer 5..." service for its entry to appear in the Finder's context menu. You can optionally set a keyboard shortcut for the service as well.
Proceed as follows:
Mountain Lion & Retina Ready
This is the first place you should look for solutions to common problems, including how to un-install.
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