I have tried disable/enable greenhopper, uninstall/install greenhopper, manually install greenhopper jar, etc.
I think this is a known bug, but the only note I saw said something about getting help from Atlassian support to fix this, but no details.
Depending on the version of JIRA/GreenHopper and Universal Plugin Manager that you are using, there are two different ways of upgrading the GreenHopper's license.
By following either the steps above you should be able to update the license.
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