Ok, if you "HAD" the CD and don't have it anymore, then it makes sense to download the game. If this is the case you could just download whatever it is that is on EA.com, install it on your desktop then put the downloaded file (probably an .exe) on a CD or flash disk and install it on your laptop.
Sort of what Tazar said earlier except more dummy friendly. His idea was to take the already installed version of UO, copy the whole UO folder that is on your local disk drive under Program Files and paste it into your laptop. Something similar to this: (C:\Program Files\Ultima Online 2D). I'm not too computer savvy but I think the downside of doing it this way is that it doesn't get registered to your computer. You won't have the option to go to your control panel and uninstall UO, you would have to manually delete the whole UO folder if you wanted to get rid of it....but why would you want to do that? lol
Whatever you decide to do, good luck.