What license do I choose when purchasing an add-on?
As Atlassian Add-ons are global, the user tier of the add-on must match the user tier of the parent application. For example, if you wish to add JIRA Agile to a JIRA 25 User license, you must purchase a 25 User license for JIRA Agile regardless of how many users will need access to JIRA Agile. If you do not purchase an add-on license that matches your parent application license's tier, your add-on will not function.
All Atlassian download products are licensed for one instance on one server, so you must purchase an add-on license for each instance of the parent application you intend to use it with.