If you have an Ataivsm license and your maintenance expired, which means that you won't get product updates, while there is released a feature or improvement in a new Ataivsm version that you would want to have, then get one of these and then login into Customer Portal to apply it to your license.
Atavism X Maintenance Plan 180 days. Suitable for Atavism X License.
Atavism X Maintenance Plan 365 days. Suitable for Atavism X License.