How to get trail period license key

I am trying integrate flexmonster for my application but It showing 
ErrorYour trial period has expired.

To continue the evaluation of our component please contact our sales team for trial extension.

You are trying to use the following key:
XXXX-XXXX-XXXX-XXXX

Current version: 2.9.25 (build 05/16/2022)

I have already tested it in same machine in a different environment / project for POC purpose now they requested to show in application when integrated in my application i am getting ErrorYour trial period has expired.