Hi Kevin
I do agree with you,am also getting the below mentioned error when tried downloading..
Not Found
The requested URL /cisco/ios/12.4/12.4.22/1700/c1700-ipvoice-mz.123-22.bin was not found on this server.
Its high time to escalate the same to the concerned peopl in CCO.
If you are really in need of downloading the ios then you can try out for some other feature set readily available for Cisco 1760 also which can fit onto the flash/memory you have in place..
regds