Complete joke. This program WILL NOT save a photo with a transparent background at all. Seriously the only reason I needed it and it wont do it. Gonna have to find a different program to use.
After removing the background in the photo with a quick action, try setting the Background color to transparent (when you click on Background color, select the swatch that is white with a red diagonal line through it). Then you should be able to click the Download button and get Transparent PNG (Best for images) as an option.