@ustk said in Updating product and preset procedure:
But anyway if nothing bad can happen loading an older preset, I'm feeling relieved already
Yup as @orange said, if you're only adding new controls, just make sure that the default values are sensible and they will be initialised to those values.
There are more advanced tools available in the UserPresetHandler class, but they are only required if there are breaking changes in your preset design (eg. because you have changed internal ranges or something else).