Install 2 different versions of Unity on Mac

I want to install2 separate versions on my Mac (e.g. 3.5.2 and 3.5.5), but I cannot figure out how to change the install directory.
Geko_X said they were able to install 2 different versions and I would like to do the same.
Any and all help is appreciated.

Install one version, go to the Applications folder, rename the Unity folder (to “Unity 3.5.2” for example) than install the other version.

You can’t change the install directory, but just rename the original Unity folder to something else (like Unity 3.5.2).

http://docs.unity3d.com/Documentation/Manual/InstallingMultipleVersionsofUnity.html