Plugin – That allows certain users to download .pdf

Hi folks. Sorry if the format of my cry for help is wrong.

DOes anyone know of a plugin that allows named users to download files (.pdf).

I would like to be able to allow users to login using their own usernames and passwords and download reposts pertaining to their own business.

I am using “Download Manager” but that only lets certain types of users download. i.e. admin, contributor etc.

thanks for any help.