I take it you are looking in the list provided in "find new add-ons" in JIRA?
That has a safety feature in it - it won't display add-ons that don't have a version valid for your system. Have a look at https://marketplace.atlassian.com - is the add-on listed there? Click on the versions tab to see what versions are available and for what JIRA versions they are compatible with.
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