Download the file from here: Trade Runner Extension File v1.1.6 

Save the file to your desktop (or somewhere you will remember).
Login to your Magento Admin
From the top navigation, go to ‘System – Magento Connect – Magento Connect Manager’
In the section ‘Direct package file upload’ click ‘Choose File' and then ‘Upload’

You will be able to see the file installed:

Return to Magento Admin and you will be able to see Trade Runner in the navigation:

Congratulations, you have successfully installed the Trade Runner extension. 

Now you need to set up Trade Runner to list on Trade Me.

Trouble Shooting Tips