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Munir Mandviwalla posted an update in the group MIS 4596 Spring 2017 – Mandviwalla 7 years, 10 months ago
JustinMind has changed their licensing model. Do not upgrade your version if it is currently working. We do not have a license for the new model. If you have already upgraded, then let me know on email. We are still working on a solution so it might take a few days to solve.
I had this problem and was able to solve it by completely uninstalling justinmind then downloading an old version and activating it with my old key.
The old versions are available here https://www.justinmind.com/download-older-versions