You can always check the compatibility for other versions of Confluence from the Atlassian Marketplace.
Attachment Download is available for installation from the Atlassian Marketplace by clicking the Confluence Server Administration icon and choosing the Universal Plugin Manager (UPM) option; it can also be installed by download from the Atlassian Marketplace.
We offer support under a Product Support Service Level Agreement (SLA) for Adaptavist Products.
If you need more explanation or have any other questions, please contact us.
Please see our documentation for information on turning off Google analytics: Turning off Google Analytics.
You can always search for previous user questions in Atlassian Answers.