I don't think Adobe would frown on that, since you are teaching people how to use their products. I record "how to" videos myself and use them on YouTube..
Edit: Yes using screen shots for educational purposes is perfectly legal, as stated in: Images and user guides | Adobe. A sample of the document (subject to change without notice):
Screenshots are individual print screens contained within Adobe software applications. See a sample screenshot. You may use screenshots in advertising, on documentation (including educational brochures), in tutorial books and tutorial apps, in video, or on websites, provided you meet the following guidelines: ...