Just unzip the file to your scripts path and make sure you leave everything in the crucutski folder from inside the zipfile. all you need to do is source crucutski.mel

Select your poly object(s) add them to the cutting list. Create a cutting plane and go for it!  very simple! lots of options, I'll do a screen capture on what everything does later.

If everything is in the proper place, use this command to execute it.

eval("source "" + `internalVar -usd` + "seths/crucutski/crucutski.mel"");

WORKS ON POLYS ONLY.