I too am having the same problem and unable to download it either way.
I have left a message on the designers website so hopefully will hear back or the problem will get fixed as I love having the 'official' CB theme's.
Maybe the mods will pick up on this thread and see if they can get some answers...or a quick fix would be nice
I got mine installed but then it froze up my bb twice. removed promptly after that. I think there are some bugs in this one. I noticed some comments similiar to yours on the homepage where the theme was announced yesterday.
I had an error when i first tried to install this theme. But i copied and pasted the link into my browser and it downloaded no probs. I haven't had any issues with my bb freezing, or any lag of any kind.
it's really an awesome theme....i hope copy and paste works for you