Considering the op has been abandoned for about a year now, I don't think it should be an issue so long as you do continue to credit Goerge in the new op. That said, it's waited this long, so let's hold off a bit longer so that I can clear it with a mod. I'll post back once I know
edit: Okay, I spoke with asherkin. In short, yeah-- go ahead and copy the op, make whatever changes to it you feel are appropriate w/ the new version of the plugin & continue to credit BrutalGoerge. Then, go ahead and post it in the New Plugins forum, as it will need to be re-approved.
Then, post back here with a link to the new thread and let me know whether (a) you're going to report this one for archival or (b) you'd like me to do so. I'm cool either way