A small additional tutorial for those not knowing how to install add-ons from zips to Blender.
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1. Go to File>User Preferences. A window will popup.
2. Change to Add-Ons tab and press Install from file:
3. Select the zip of your downloaded plugin:
4. Tick the box in front of the plugin to be activated, then Save User settings.
5. Your Add-On has been installed successfully!