Pictures & Videos extraction from Forum Website

Hello everyone , i was owner of a website/forum which was famous and full of members. Actually, one of our team is gone, and didn't reply back to us, he was carrying all the technical section for our forum, and actually we don't have any access to our back office. So, i need someone, who is able to extract all the pictures and videos from our forum (there is multy protection there, as there is "level" members, if you are an "advanced member" you can access to more parts of the forum, which there have more pictures, ect... so we need an extraction for all that, and be downloadable on .rar files or others. don't need to extract text and thread, we gonna copy it to a new server and new website oursleves. So , for explanation, we don't have any access in our back office no more, we gonna make and take care the creation and adding the thread to the new website, but we need someone who care extract , if it's possible, in one time, all pictures and videos have in this forum. thank you, regards dan