Hi @robertol6836527 ,
It is not the case that the upgrade won't work if you don't do the restructuring. That is totally dependent on your use case. If you are using some features which are now moved to a new location, you would then need to restructure those things. Although, I would like to add, many of them are backward compatible, so they should work in the old location as well.
Example:
The workflow models are under /etc/workflow/models in the old versions.
But from 6.5 onwards it is under :
/libs/settings/workflow/models
/conf/global/settings/workflow/models
/var/workflow/models
For a more detailed version, you can go through : https://experienceleague.adobe.com/docs/experience-manager-65/deploying/restructuring/all-repository...
https://experienceleague.adobe.com/docs/experience-manager-65/deploying/restructuring/repository-res...