How to download images from a site?

Site URL: https://www.replay.charity

I feel I'm completely missing a trick here. I'm helping a friend with a charity website but don't have the original images uploaded to the site (and she can't seem to find them). Is there an easy way to download the images already uploaded so that I can use them in some designs before re-uploading them? If not, any tricks would be greatly appreciated, otherwise I see myself using screenshot and then optimising if the quality isn't too badly affected! Thank you!!!!