I'd really like to try before I buy

Correct, there is a 50MB cap, and you shouldn't come close to that with a single icon set. The "server has been reset" error is not what you get when you've reached your limit. It's what you get when you have a bad connection to a web site. Perhaps you hit it at a time when there were too many other users downloading as well. I'd suggest trying again later.
Just for the record, subscribers to the site have more bandwidth available to them.
Any Stardock purchase, or a WC subscription, will remove the download cap. I'm sorry you've had trouble completing downloads........ may I suggest a download manager, such as FlashGet, GetRight, or DAP, so you can resume unfinished downloads.
http://zdnet.com.com/3150-2071-0.html 
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