Checked the link - it works fine. The place that holds the pdf files is an open directory. (for those of you not familiar with that: it's kind of looking into someone's private server.) You can download them by ctrl+clicking on the links and save them to your own computer.
This way you don't "steal" the work of a designer. Before you put something in the download section of the forum, you really must have the permission of the person who made the design. Otherwise it is kind of stealing.
Alfonso Moreno, for example offers a lot of very good shuttle stuff on his own site,
AXM Paper Space Models. But when you would download one of his creations and put the pdf into the download section of the forum, you do not give him all the credit he deserves. besides, that way people might miss what else he has on his site.
If I had a weblog and people would copy paste content of it to their own site without telling me I would be angry. The fact that it is free doesn't mean it's public property.
The same with the Saturn stage. As long as Frederic Bouchar has not given you his blessing about stashing them into the downloads on Zealot, you should not do this. He might not have a website to host it, just an open directory, but that doesn't mean you can mess around with someone else's work without his consent.
Placing a link to the site or location where you can find the stuff is the best way to get other people to download the model.
regards,
PK