I have CS6 and my University has the CC. I recently used my University computer which has CC and now find that when trying to complete my work on my lap top I am unable too because After Effects says I need to upgrade. Do I have to upgrade to CC? I'm not finding any other available upgrades that will allow me to finish my assignment on my computer after using After Effects CC.
Go back to school and save your project as a CS6 version using the "Save As" feature.
Depending on what version of AE CC your school is running, you may need to take a couple of steps to do it: opening After Effects projects from previous versions and saving back to previous versions
Or, to make things much easier, you could upgrade yourself to the Creative Cloud. There are great student pricing offers and/or upgrade pricing from CS6.