For the import or export capabilities, you don't need any CAA RADE licence for CATIA.
For the export capabilities (CATIA V5 -> WINDCHILL), you need a PX1 licence for CATIA V5. The export works with "import from a file" you can acess in the WINDCHILL web client. The integration of this function is not yet totally integrated within CATIA V5.
When the export of a CAD model from CATIA V5 into a Windchill project is done, you can download it easily with RIALTO as shown at this page :