want to upgrate jira 6.3.14 to 7.0

[manyam s]

We are having a jira with version 6.3.14.We want to upgrade the jira 6.3.14 to version version 7.0 or later

[Nic Brough -Adaptavist-]

Start with a look at https://confluence.atlassian.com/adminjiraserver075/upgrading-jira-applications-935390934.html

I would strongly recommend that you take the path 6.3 -> 6.4 -> 7.0 -> 7.whatever-you-aim-for