Older versions of add-ons are available on https://marketplace.atlassian.com
JIRA Agile in particular can be found here.
Download the most recent available version for your version of JIRA and use the Installing by file upload method to get it up and running on your instance.
This should cover all 3 of your questions
Hi Kahu,
Yes, JIRA Agile is available for that version. Just to to Administration > Add-ons > Find New Add-ons and search for JIRA Agile. It will install the latest compatible version to your JIRA version.
Cheers
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