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A commercial license is needed on all production Jira servers for doing production work. Every commercial license comes with an unlimited number of developer licenses that can be used on non-production Jira instances corresponding to the one where the commercial license is installed. E.g. in a Test-Staging-Production scenario a commercial CMJ license is needed only on the Production Jira.
But for a migration a commercial license is needed on both the source and target Jira servers, as they are usually both production. If the license is needed only for the duration of a migration, you can purchase a short-term (monthly) one directly from us - please contact sales@botronsoft.com or open a license request at support.botronsoft.com.
You can use a trial license for evaluation purposes only.