This add-on is only compatible with XenForo 1.2.
As per the above image, this very simple template modification triggers an Auto Complete search when you begin to type a template title.
Do not attempt to install this on XenForo 1.1.x as it will not work.
There are no files to upload.
Instead, you just need to extract the XML file from the downloaded ZIP file and install it in your Admin CP.