I'm afraid broken downloads is a network issue. I regularly use a number of Gnutella clients (both Windows and Mac). Some clients will give you more or fewer search results under the same conditions, but as far as downloads are concerned, you'll get hosts disappearing in the middle of a d/l or sitting at 0kb/s in ALL clients. It's a matter of being patient and waiting until you find a stable host with enough free bandwidth, especially when you want a high-demand file.