Download the solution and import it to CRM. Add the Security Role: Dynamics Numbering to all users that require access to the solution’s entities. Read here on how to import CRM solutions, assign security role to users and how to enter the product key for extended trial version (7 days trial does not require product key) or for paid license.
Auto numbering functionality can be added to any field of any entity.
Click: Settings>Auto Number
Select the entity, field(attribute) and the auto number format and click submit.
The auto numbering function is now ready to be used