Hi Mike,
For reasons I am sure you will understand I do not want to post my email on a public forum. As you do not have your email listed in your profile either, that leaves us a bit stuck!
If you could zip the plugin along with a text file containing your email address and upload it to somewhere like www.yousendit.com (Send the file to your own email address) it will then give you a link for the download which you can post here which will be valid for 7 days. I will try and have a look, but I have no experience with PCstage, I use LightFactory (www.lifact.com) !
If you have to use 2 laptops then simply having the two connected via DMX would be an effective, if not expensive solution!
Laptop 1 with PCstage and USB DMX out interface
Laptop 2 with USB DMX in interface and Capture
Presumably the PCstage plugin is getting the current dimmer levels, and sending them to Capture, whilst your USB dongle outputs DMX, but thats just a guess! Quite what or how remains to be seen.
Regards,
Paul