Plimus re-activated my download link and everything is peachy.
When I first encountered the problem, all the information Plimus gave lead me to believe that my only course of action was to contact Bit Blot. Of course, I now know that this is not true. I just received an email reminder of my purchase from Plimus and that if I had any problems, to follow a link...
http://home.plimus.com/ecommerce/buyers/buyers-support... I selected an option for "Non-responsive Vendor" on the linked page and gave a brief description of the problem. Within a day I had my download link re-activated and now I'm swimming away in the murky depths of bliss. Oddly enough, there was a stipulation in the email saying that if after 2 days the vendor does not respond, then fill out the support form and submit it to Plimus. 2 days? How nice of them to tell me this after 21 days of passively telling me to go bother Bit Blot.
Hopefully, this helps others who are looking to download Aquaria again. Just request a download from Bit Blot, wait 2 days and visit Plimus' support page. Of course, you should have your order number handy and, I'd imagine, use the same email address as you did with your original order and there should be no issues with the request.
I'd just like to say that I would have appreciated a clearly posted locked sticky thread with a link to Plimus' support page detailing how to re-download an order. It would have saved me some time, you know? ;-)