Problem Definition:

If we looked at the older JIRA Service Desk Marketplace listing before JIRA 7, it appears that JIRA 6.4.12~6.4.14 is not listed to be compatible with any JSD version. But, it seems that installing JIRA Service Desk 2.5.9 to JIRA 6.4.12 is possible and there is no functionality being lost.

Suggested Solution:

Update the page with the correct JIRA Service Desk version that is compatible for JIRA 6.4.12 to 6.4.14.