Well, that's not a private link exactly. Automattic is the company behind WordPress.com.
It's a SVN repository and many people are unfamiliar with that. It's just where Automattic shares it's GPL'ed themes.
I'll make it easier for you, here is a link to that theme on my website.
I've zip'ed it up for you; I have not made any changes to the WordPress.com copy.
Just extract it into your wp-content/themes directory. It will extract a directory called fjords-wordpress-com. If you activate it on your blog it should be good.
I checked on a test blog, this copy does support tags.