Update older template schema

[PedroMordeP]

I have an old template schema (2018/07) that is not working on the latest version of the framework.

Is giving "01/01 - Initializing Engine" and doesn't do anything.

I think this is because is now deprecated and the framework doesn't have the serializer for this schema?

Is there any automatic way to upgrade this template without creating the template again?
Or have any ideas on how can I do this?

Thank you