Substance 3D licenses are available for students and faculty on individual computers (not just lab computers), but currently they cannot be licensed directly through the Adobe CC app.
Instead, you have to visit this link to create an account to access a free educational license.
You’ll be given a license key file and the opportunity to choose which of the Substance programs you want to install (Painter, Sampler and Designer are available). You’ll license the programs using that license key file.
See this Adobe help article for more information about individual non-lab Substance 3D licenses.
Students with older versions of the programs and "locked" Adobe CC apps should use this article to unlock them and install newer versions.
Please contact firstname.lastname@example.org or your instructor if you have any questions.