I've just found some information for everyone:
If your downloading the patches 1.5 CoD and 1.51 UO then could you PLEASE check that you've downloaded the right file size.
United Offensive: [color=red]115.88 MB (121506833 bytes)[/color]
Call of Duty: [color=red]36.1 MB (37853246 bytes)[/color]
If you download the wrong file size and try and install the patch, you may come across problems with the game.
*added to important sticky list*