You can use a file sharing program to share that file. I know file sharing programs aren't a big hit on this forum and I understand why; because so many use those programs for illegal means. However they are very useful if you are trying to transfer large files when email and file transfer over ICQ or MSN doesn't work. In those programs you simply put the file into a folder, share the folder in the program and send the ed2k link of the file to the person(s). All they do is open their eMule or eDonkey program and paste the link and it automatically downloads from you. Of course you have to be online in the program for them to download from you, and those who download from you have to have the program. Personally I think those programs have been given a very bad reputation due to the nature that most people use them for, but they are not the bane of all evil either. And can be extremely useful for situations such as this. Now whether Renderosity would be ok with you posting an ed2k link to a file is another thing. Personally I don't see it being any different than uploading the file to a website and people downloading it from there. The only difference would be that instead of downloading it from a website, they would be downloading it directly from your computer.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi