I am able to download images. I am a member of the 10 photos monthly plan. As I download the images, the image count left shows 12 images. I am using a windows 10 surface book with the latest internet explorer browser. Usually it shows as 10 images on top. After I download the images it doesn't show up on my Previously Licensed page. I downloaded like 5 images today. The total still says 12 at the top of the page. I understand they are having issues with the purchasing of the images so maybe they are working on the issue.
My guess is that you aren't downloading correctly and they likely still have the watermark on them.