Well, I'd suggest using a CD-RW, and burning an HTTP Install CD (it's an 4 MB ISO that will start the installer program, and allow you to do the entire install/upgrade by downloading all the files that you need on-the-fly). Now, this assumes that you have an always-on high-speed connection (but, I assume you do, since you have the bandwidth to download the ISOs in the first place). You can get the FC2 Boot ISO here
After you burn the ISO onto a CDR or CDRW, you should be able to boot from it. when you get to the boot: prompt, type in 'linux askmethod' and hit return. This should eventually bring up a menu that asks what type of install you'd like to do. Choose HTTP install. When it asks for the location of the server, and the path to the files, you can point it here:
(You can also point it to a mirror, with the same path).
Hope that helps