Hi @neggard,
Hope you are well.
For Category access and package roles please follow the below steps as I describe below,
Before giving access to a certain category for a particular role you have to set from the edit category option, then you have to make empty for Allow Access option or giving a particular role on it like as I image attached or as usual for select member option too,
https://share.getcloudapp.com/X6ulq4yo because
Package Access = Package Access + All Category Access = All Visitors + Author = All Visitors
and Package Access = Package Access empty + Category Access(Author) = Author
or Package Access = Package Access(Author) + Category Access(Author) = Author
More details can be found in the below link.
https://www.wpdownloadmanager.com/doc/add-new-package/package-settings/allow-access-access-control-option/
Hope you understand now.
Thank you