To get an image for Daemon, you're going to need something like Alcohol 120% or CloneCD to make them. Nero will do it, but I'm not sure that it makes a 1:1 copy like the others. Alternatively, you can download an image file with a BitTorrent Client and mount that with Daemon.
As for mounting an image with Daemon:
1)Boot up Daemon Tools(If it's not started already)
2)Choose "All Options On" under the emulation menu. The tray icon should turn green.
3)Hide the SafeDisk Protection using
sd4hide.
4)Virtual CD/DVD-ROM > Device 0 > Mount Image. Find the image file.
5)The image is now mounted and acts like a normal DVD.
Alternatively instead of using sd4hide you can use CureROM, which has a wizard for mounting images.
DAEMON ToolsCloneCDAlcohol 120% (CAUTION:Contains spyware toolbar)