The images are fairly large, ranging from just over 1.2GB to just under 1.5GB, so they will certainly not fit on a CD, they require either a DVD or a 2GB or larger USB stick. These are hybrid images, so if you already have a Linux system you can simply dd them to a USB stick; otherwise you can use the windows Image Writer to accomplish the same task. For details on this, Clem has written a very concise How to install Linux Mint via USB tutorial.