For an installed version of JIRA.
If you own an installed Commercial license key for any Atlassian product (except Starter Licenses) and it is under active maintenance, you can generate free developer license keys by logging in to my.atlassian.com and clicking on Developer License. Plug this in to your test instance in the License Details page of your admin.
JIRA/Confluence hosted licenses and Studio licenses don't offer Developer License.
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