Error when installing Android Modules in Unity550

Greetings,

I'm attempting to get Android installed as a platform in Unity5.5.0f3 but am running into issues. After selecting the Android platform and clicking the Open Download Page button, the installer downloads as you would expect. When I reach what seems to be the 100% mark, I receive the following dialog:



I'm not really sure where to go from here so I'm "contacting the software manufacturer". Thanks!

My Specs:

iMac (Retina 5K, 27-inch, Late 2015)
Processor 3.3 GHz Intel Core i5
Memory 16GB 1867 MHz DDR3
Graphics AMD Radeon R9 M395X 4096 MB
OSX Sierra v10.12.3

 

I was able to find a solution via this link: http://answers.unity3d.com/questions/1113370/manually-install-unity-module.html. Essentially, re-running the Unity Download Assistant and re-installing the base with the Android module. Hopefully it was helpful to identify this issue however. If not, sorry for the post.