legally you can't, they only offer updaters on the website as I am sure you have found.
They might sell you a set of disks, or you might be able to buy them on ebay but you'll not know what you are actually getting at that point, or you might find a friendly canon owner who'll send you a copy through drop box etc. afterall these programs are of no use to you unless you have a canon, and as you have a canon you should have the programs.