How to manage file-in-use errors for OS X applications upgrades
Many applications in OS X are self-contained packages that you install by dragging and dropping to your Applications folder. Since all of the program's required resources are within this package, when you need to update or upgrade the software, you can download the update and drag it to your Applications folder, replacing the current version you have installed.
This method of managing programs is very straightforward and usually works without error; however, at times you might run into problems when upgrading where the system gives an warning claiming that a component of the application is in use.
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