Raghu,
You need to compile the catia abstractions dll's for the specifica version and SP of Catia that you want to use with Windchill and replace the zero size ptc placeholder zip files.
Once they are compiled they are hosted on the Windchill Server, the users then download them automatically as part of their WWGM install to the client CAD machines. If they are not there, then the users will not be able to use Catia with the WWGM.
As Lori say's PTC are not allowed to distribute the compiled Catia code; it is a Dassault Systeme's "tax" really rather than PTC's, in my opinion, you are effectively developing a module for Catia and Dassault want to charge you for the priviledge.
Rgds
Gary