I accidentally downloaded an image instead of saving to library! I won't ever use this image, is there a way I can return this and get a download back?
Sorry to hear that.
Please share the file ID which you have accidentally licensed so that we can further assist you.
Since you have accidentally licensed three Stock files, I have added three image licenses to your account so that you can use it against different images.
Also, I would suggest you to refer to the help document Stock FAQ: How to license an image with Adobe Stock? in order to license an image correctly.
Hope this helps!
Feel free to update this thread in case of any additional questions.