If CAPICOM 2.0.0.3 is not already installed on your system, this page will download capicom.cab (168,742 bytes) and offer to install and register CAPICOM 2.0.0.3 automatically.
The Official Platform SDK Redistributable: CAPICOM 2.0 contains the same CAPICOM 2 library as well as code-samples for several programming languages and instructions for manual installation and registration.