Please do a forum search before you post the next time you need help. I don't want to sound rude, but this information is displayed throughout the forum in many places.
Basically, all you need to do is download either the Full or Basic version of the UBCD, rename the .zip file that you downloaded to either ubcd-full.zip or ubcd-basic.zip (which ever one you downloaded), and then copy that file to your <ubcd4winbuildroot>\plugin\Multiboot-003\ubcd folder. Once you get into UBCD4Win Builder, go to the Plugins area and look for the UltimateBootCD 4 DOS entry and click on the Config button. Choose the option based on what you downloaded and it will take the .zip and automatically extract all of the files it needs. Then just click on the Enable button for the plugin TWICE so that it's enabled (it now should say YES) and then you can continue on building the UBCD4Win as normal. Once the CD is built and you boot it, you'll be at the multiboot menu area and the UBCD will be one of the options.
I know it sounds like a lot, but there are a few minor bugs with how things are setup right now, so you have to do it like that until we release a new version. Thanks.
BTW, your total .iso size with the defaults with this combo CD will probably be around 675MB. If you want, you can also add Knoppix to the mix and make a UBDVD4Win (which would include the UBCD4Win, UBCD, and Knoppix) which would put you around 1.30GB or so. More information on the Knoppix plugin is
HERE.