Retrieve images by old image keys

I have some old image keys. I want to retrieve the images. I found that mapillary.com/embed?image_key={old_image_key} will redirect to mapillary.com/embed?image_key={new_image_key} for most of the old image keys. Then, I can download images with the new image keys.

However, after I use this for a certain (around 200?) times, it starts blocking my application.

Is there a limit on this? any suggestions? Thanks!