Paid and Free access buttons

We have a selection of elearning courses available on a website I'm managing, historically these courses have been free for everyone to access. However we're now having to restrict free access to NHS staff, NHS partners and university students. Everyone else will need to access them via a paid link.

Clearly I dont know who the visitors to our website are so I'm reliant on them clicking the one of two buttons that reflects the group they belong. How best could I communicate this?

Perhaps something like this? The one button would take them to the system that recognises their email address to provides free access. The other would take them to the commercial platform that takes payment.

Any thoughts?