Cannot access blog after updating k2 theme

Ok, so I downloaded the latest version of the k2 theme (www.getk2.com), and dragged the folder into my FTP client to overwrite the older version. Once it finished, I tried accessing the WP dashboard and I got nothing. I tried overwriting again… no dice. I deleted the k2 folder completely from my files… no dice. I copied it over onto the FTP again… no dice. Tried uploading an earlier version of K2. Nothing.

Here’s the web address: https://www.small-scale.net/stash

What to do? How can I access my dashboard? I am running WP 2.3.3, I think.

(And when will I learn: if it ain’t broke, don’t fix it…?)