Just follow the install advice you find there. (What is not mentioned is that if you still don’t see the GPS panel when installed you may need to click on preferences in the file info dialog and select “Restore default dialog”)
Be aware that having rich metadata in your Master collection is a good thing for you but you may want to consider erasing such metadata from versions of the files going out to clients if the images contain subjects such as endangered species or private gardens where its best not to reveal the exact location.
Contact me if you need assistance in automating the stripping out of metadata from retail files, this can be done field by field right down to retaining only essential metadata such as copyright, contact, caption and keyword information.