After downloading you have to commit it if you don't have the Automatically commit when installing CDPs box checked in File - Settings - Miscellaneous. Then check the kuids you just downloaded in the main window of CM3.3 to see it they have errors or missing dependencies. If the status icons are showing problems you'll have to fix them before they will show up in Surveyor or Railyard. If you have problems you can't fix, post the kuid number(s) and error messages here and we'll help.
Bob