1) I have an un-managed package. The subscriber has installed in into their sandbox and have added 30 fields to a custom object and page layout. I’ve created a new version of the app and we want to install it. Does the subscriber have to un-install the first version? Will they lose their custom fields? Can they preserve it for the new version?
2) Similarly, If the same scenario exists with a Managed package, will upgrades wipe out the custom fields? Will they have to un-install to install a new version?