When using Google Classroom, I had some trouble id each student's work. So I thought it was a good idea to make a personal folder for each student in each appointment. This way, when I download the appointment folder in a zip, I don't lose the student's identity.
Use the .gs and for activators, use 2: unStarModified() first, and some hours later main().
You must config the 3 variables in the code:
TEACHERS: an array with the teachers mails.FOLDERID: the classroom drive folder id.FOLDERNAME: the name of the folder that will be created inside each appointment folder. This is the folder you will download as .zip.
Sorry for my mistakes, I am relatively new to Google App Scripts. You can contact me if you have any doubt.