To install the add-on, locate the addons folder within your Blender configuration folder.

In most cases, it is located at C:\Users\<your-user>\AppData\Roaming\Blender Foundation\Blender\2.79\scripts\addons\.

If you're on GNU/Linux, your add-on folder should be located at ~/.config/blender/2.79/scripts/addons/, where 2.79 is the Blender version you are using.

For more information, see Configuring Directories ― Blender Manual.

Extract the io_revolt folder into the addons folder.

Installation Path

Now start up Blender and open the user preferences (File -> User Preferences...). Click on the Add-ons tab and enter Re-Volt.

User Preferences

Tip: Now, click on Save User Settings at the bottom of the User Preferences window to keep the add-on enabled when you restart Blender.