Please, note that Marketplace Atlassian offers you downloading only installation file for JIRA 7.1.x.
Visit our Purchase page for JIRA2JIRA Connector to download correct installation file for JIRA 6.4.x or 7.0.x
we present you the new JIRA2JIRA Connector add-on. We are continously improving and adding new exciting features. Follow our ROADMAP.