Access control pre-sales question

Good morning 🙂

My question pertains to access control.

I’m attempting to sell my non profit on a snazzier website – but we will need some way to store and distribute files. Currently we have a board of directors section, a students section, and an instructors section.

How would I create something like that with Download Manager?
Would I need Pro?

The only access levels in DM Free are Members and visitors as far as I can tell. So I’m wondering how DM Pro handles that.

Thanks in advance for your advice.

-Taresa