If you're still stuck, please explain where - "I cannot generate the licence" doesn't tell us what step is going wrong.
If you already purchased the plugin, you can find the license key for it in your MyAtlassian account (http://my.atlassian.com/). After copy your license, you can update the license details following the instructions in the link below:
Atlassian Summit is an excellent opportunity for in-person support, training, and networking.Learn more
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG