Beginner needs help with Kuka PRC for Grasshopper

Hello to all:

My community workshop just got a used Kuka KR 30-2 robot arm with a KRC-1 control cabinet. I was recently told by someone to check out Grasshopper and the Kuka PRC.

I am considering joining the group that created the PRC software, but since our KRC-1 is very old (WIN 95) there may be some compatibility issues, and the cost to join that group is a little steep for me right now, so i'd rather not pay for membership until I know their software will work for me.

Having said that, what's the best way to get started learning this process? Has anyone else out there been using the PRC and could give me some tips?

I'd like to be able to machine reliefs and full-3d sculptures with my Kuka. I've been doing the reliefs on a CNC router.

After looking at the PRC in Grasshopper, it's my understanding that generating toolpaths involves using the surfaces of objects. My biggest mental block is that I don't understand how to generate the toolpaths for multi-sided objects (like a full 3D, in-the-round sculpture). I've tried searching for how to create toolpaths in Grasshopper without the PRC, and it is possible, but it's still too big of a jump for a very inexperienced user like myself.

I'm looking to this forum for initial advice, as there's only one person I can email about the PRC for that advice unless I pay up. Thanks for any help!