If you buy any license , you can download developer license key also.
Note : you can't use this license for any production systems.
You can go to https://my.atlassian.com/products/index
you can below details under each license. Using view developer license you can get developer license
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events