Nintex 2013 workflow option not available for the list.

Hi,

1. We created a list and associated Workflow with it using sharepoint designer.

2. Now as the requirement changed, we have to move Sharepoint designer Workflow to Nintex Workflow.

3. So we deleted the old designer workflow associated with that list.

4. We have now created a template of the list but are unable to find the option of Nintex workflow for that list.

5. But Nintex workflow option is available for the new list created.

6. We have already tried Activating and deactivating the Nintex workflow option from the Site collection and Site features.

Thanks