When migrating from versions earlier than version 5.3 you may see a dialog appear like the one pictured below. This is due to changes in the Umango licensing model. Your old license doesn't support the number of job sources you have configured. You will require your product key to be updated and reactivated.
Please contact Umango support and provide your old Product Key. We will upgrade your key and ensure you do not lose any of the functionality that you have been enjoying.
We apologize for any inconvenience that you may have experienced.
Link to this article http://umango.com/KB?article=77