For Gathering Storm
Extract to the install location and overwrite the file when asked.
If you need the original, go into the folder named Original(provided in archive) and extract that folder to the install location.

For The latest update

This is the original file should you want to return to the un-modded version.

For the Rise and Fall update
*Due to some issues i am unable to test this but it should work. Would appreciate someone commenting if this works or not.*