If you are wanting to used the application as is you will want to download
Otherwise you can modify the source to suite your needs.
Once you have CruiseControl.net install you will want to setup your ccnet.config in CruiseControl.net\Server folder to look like this.
<!DOCTYPE cruisecontrol[ ]> <cruisecontrol> </cruisecontrol>
when you have CCCreator setup it will add a entry to this file for the project you pointed it at