I did what I could to make it compatible with latest jira versions, and contributed that code back, but I'm not interested in supporting it. Not without payment anyway.
The original author stated that he was not interested in the project anymore. Also Atlassian were asked if they could facilitate some sort of "orphanage" for plugins, maybe through answers or something.
You *really* need to add some more details to your question if you want the best help we can give ! ;-)
I presume you are talking about the "User picker from Project Role" plugin?
I doubt it's support when the author doesn't even put their contact details up
however, you could try jamie Echlin as his name appears here... also here http://blogs.onresolve.com/?author=3
Given jamie's answer, you've options are limited:
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