Crowd 2.7 is compatible with your JIRA version (https://confluence.atlassian.com/display/CROWD/Integrating+Crowd+with+Atlassian+JIRA#IntegratingCrowdwithAtlassianJIRA-CompatibilityofJIRAandCrowdVersions)
Btw, I suggest you to try this integration in your staging environment first.
Hope this helps,
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