Custom Reports is a plugin for Matomo and is available for purchase on the Matomo Marketplace as a yearly subscription. While the subscription is active, you will receive all updates for this plugin. If you are not sure there is a 30 day trial to test it out.

The plugin is also available to anyone with a Matomo Cloud Business or Enterprise plan. For details please see here or start a free 21 day trial here: 21 Day free Matomo cloud trial