How do I host a large file on my server?

I have created and uploaded an .iso file of my team’s rugby game. People are having problems with the direct link. Apparently, the file is too big for an http request. However, I can’t just give them an ftp username and password as it would compromise my files. Any suggestions?

The .iso is 4.2gb
Torrents are too sophisticated for my users (and it pisses off Comcast)
Embedding the video in a webpage is not really practical