This has been fixed, what version are you using?
I will update MAC at some point.
I'm using JIRA 5.1.7 over a Linux Server and installing 1.6.4 plugin version but it not runs.
listing "user-installed plugins"
- plugin appears but no modules are found.
Is it possible that plugin not runs on JIRA and Linux?
No, that's not really possible in this case. Take a look at https://jamieechlin.atlassian.net/wiki/display/JUP/User+Picker+From+Project+Role+-+Issue+Alternative+Assignee?focusedCommentId=2555949#comment-2555949 and pick the right version.
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