How to install the TT_Lib2 library?

After downloading an extension and installing the .rbz file, I was notified by a dialog box that it needed the TT2 library to run. The same dialog permitted me to download the library, which is not an .rbz file. How may I install it properly so the extension will find it when needed?

Install it automatically from the Extension Warehouse. (Window menu)

You can get the rbz archive here:
http://extensions.sketchup.com/en/content/tt_lib²

Thank You DaveR and DanRathbun! I was able to install TTlib2.

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Did it not return an RBZ? What did it return instead?