Alright i was also wondering if i could just put those files in Manuel into blueplanet2_multi because the address gives me the downloads i need to do it.
You should be able to do that. So long as you have all the files in the correct folder, it should work perfectly. All the SVN does is provide a way for people to be able to share files which are undergoing development.
However, if you just manually download everything, it may be difficult to make future updates because that means you will manually have to re-download everything. Once you get the SVN setup, updating is as simple as a single click!
I hope that answers the question you had.
Also, even though the setup instructions are the same, that topic is somewhat obsolete.
Here's the new one: http://www.hard-light.net/forums/index.php?topic=74974.0
It's a sticky in the BP forum.
Welcome to BP:Multi