Wordpress site download? no login details

Is there any way to download a WordPress site that you didn't create to use as a base for a new site?

I have a friend who has asked me to develop a new website for them but the company who do her site at present update the site for her with a large monthly fee - the site is pretty big so to save time copying and pasting every single page to a new design etc is there a way to download all the content from her current site if she doesnt have the login details?