I stopped paying for my membership in November, why is the included software now deactivated?

Q:  If you stop paying for water, power or phone, what happens to your service? 

A: It stops until you pay everything owed and make arrangements to have it turned back on. 

This user-to-user forum cannot help you with your cancelled services.

Please contact Adobe directly.

https://account.adobe.com/plans

Or phone customer service M-F during normal business hours.
https://helpx.adobe.com/contact/phone.html

You can't just stop and start paying. You agree to a contract to pay for the whole year. If you cancel, you need to pay the early cancellation fee. If you didn't pay that, your account is going to be unusable, and you have a debt which may keep growing. In any case you will need to contact Adobe or your place of education (depending on who sells the license).