Writing GPS Metadata to Masters

There is already an archived discussion that contains an aswer on this subject

Writing IPTC Metadata to Masters and an the answer is given in that thread is to use a plug-in called Maperture Pro.

Unfortunately this plug-in is no longer available. It can still be downloaded (from a number of places) and installed but you cannot get past the registration process as it has been shut down. Therefore I would like to ask the question.

Does anybody know how can I write GPS data (from places) back into my (referenced) masters without exporting them or duplicating the functionality with tools like, the otherwise excellent, exiftool outside of Aperture.

This is really upsetting my workflow.

Thanks, Ian