If you want to download the dummy content, the link points to an unexisting url.
In http://vanillaforums.org/docs/themeguide/arsenal pointing to http://blog.vanillaforums.com/dummyvanilla.zip
Any other URL to download it?
Sadly there is no official dummy data for Vanilla. But as (nearly) always, there is a community replacement for missing features: http://vanillaforums.org/discussion/26297/dummy-data-for-vanilla-2-1b2
I wrote a crude plugin that is enclosed with the zip. If you understand some Vanilla coding, you might be able to change it to build up your own custom dummy data.
I just want to point out that the page you were reading is the deprecated documentation. There is something quite similar on the community wiki: http://vanillawiki.homebrewforums.net/index.php/The_Ultimate_Theme_Guide_for_Designers_-Part_1_of_4:_Your_Arsenal
Doesn't look like that page has an updated link either in this case.
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Thank you @R_J , I will try with your link.
@hgtonight , nice to discover this wiki, I didn't know about it. But the broken link is also replicated in vanillawiki.homebrewforums.net/index.php/The_Ultimate_Theme_Guide_for_Designers_-_Part_1_of_4