For installation, please follow the `readme` in the package. Essentially, you´ll have to make sure that the program is somewhere in the PATH.
Please note that the information used to create the subtitles is extracted from the raw AVCHD video stream. It may get lost if you rerender the video after editing. Please use a video editor that let´s you save without rerendering. Many editors have that option.
The program uses Google to translate GPS information to an address (if this was present in the video file). Of course you'll need an Internet connection for this to work properly, and also please note that Google has limits on how many queries you can make per day.