GURPS and Harn

I'm looking to use GURPS with Harn but I'm not sure of the best way to go about it. There's a few conversions out there but they seem to be for 3ed.

Can anyone recommend a 4ed GURPS/Harn conversion please?

Also, is Ritual Path Magic here: http://ift.tt/1zcgoSC

Found in GURPS Thaumatology, or is it like it says a stand alone prodcut?

Finally, I've read the blurb but what setting exactly might I use Ritual Path magic in?

Thanks all.

GURPS and Harn