How do I connect my substance3D account to my Adobe account when I only have a student license??

Ok I´ve been trying to connect my Substance3D account to my Adobe account but all I find it that I have to save my invoices from the billing tab on the Substance3D website but I have a student account and thus no invoices to save. I´ve also found that I can just save my license key to log in on a new device but what happens when my license runs out, will I just be unable to renew it and have to start one of the paid subscriptions on the Adobe website?