Display Custom message for License Key Expiry

Hi Team,
I want to display some custom pop-up message for the License Key expiry.
Could you please help me in achieving this...
what I have found is that we are validating for the license key in the 'flexmonster.js' file- which I do not intend to modify.
Is there a way I can override this and display a custom message to the user in case of a Licence expiry that states:
"Please contact the Technical Support Team for Flexmonster Licence Renewal."
Many Thanks,
Kishlay