Specifically, from this post.
I scoured their simfileshare, and even found a promising folder! Advent Calendar Thingy ! ...but alas. I open up 13.zip, and it's not it. It's a DIFFERENT advent calendar. Ayyye...
And in the GOS section, there was Advent 2011.. but sadly, no Advent 2012.
Is Advent 2012 lost to the dropbox purge (that ate a lot of trapping's previously reuploaded content)? Or is it in the simfileshare somewhere buried in a subfolder?

I suspect it's missing, but maybe someone will know "Aha, I know exactly where it is!"

@Nottakenaway - I went to the post you linked to and was able to download all 34 items listed there, by clicking on the words Binned, Download, Custom and Geneticized & Townified. Even managed to get the swatches.

@Michelle
Thank you for the tip, letting me know that it must be a browser issue.

When I was clicking of the links, trying to open them, they instantly blinked away, so I had thought that they simply were not functioning.
But when I manually copied the link address, opened a new tab, then pasted the link, only then did it work.

So basically Chrome is buggy.