What's the MY?
If it sprayed from outside the cabin, then it is one of three things.
1) Master Cylinder blew a gasket.
2) Flex hose blew out (not sure where it's located on the Boxster)
3) Metal clutch line was cut or a hole worn in it.
If the leak originates inside the cabin, then it's the master cylinder seals.
What you need to do is put some cheap DOT4 brake fluid in to help you locate the leak. Once it's located and you know what it is, it will be easier for one of us to help with replacment instructions. I'll be happy to look it up in AllData and see if there are some instructions there.
I hope it's one of the lines. Those are much easier to replace than the MC.
