You can always grab my live installer iso and install from there.
http://chrisbuechler.com/m0n0wall/liveinstaller/The images on the CD are old as it's been ages since I've had a chance to go through the arduous build process to put together a new CD. But I still use it myself when I need to install m0n0wall on a hard drive, I just install 1.11 and then upgrade it to whatever version I want to run.