Depends.
If you have a full commercial licence for your production server, and the dev/test servers are just for supporting that production server (i.e. to try out new versions of the Atlassian apps, test plugins, try different configs etc), then just download the "developer licence" you can get from the licences page on your my.Atlassian.com account.
If you're using this dev/test systems for real work though, install them and go buy more licences with the different server-ids they will give you.
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