This might be also an answer to that thread: http://photography-on-the.net/forum/showthread.php?t=36399, but it has relevancy in itself.
I had the problem to install the Canon-Software on an ThinkPad X without built-in or external (USB/FireWire/PCMCIA) CD-ROM-drive. The solution is to make a disk-image with BlindWriteSuite and then mount it with the DAEMON-tools. This works - but be careful, not every CD-ROM-drive can read out the Disk - i.e. Sony CRX185 is not able to read out the CD, but LiteOn SHW-160P6S does!
BTW: this information IS NOT for making illegal copies of the CD-ROM - you are only allowed to do the described if you have the allowance to install the software anyway!