I understand you’re looking for guidance on (often referred to as CAPICOM 2.1). However, it’s important to know that this component is deprecated, unsupported, and no longer recommended by Microsoft for secure development .
If you’re maintaining old software that requires CAPICOM, plan to using modern APIs. If you need it temporarily for a legacy environment, locate the installer only from trusted offline archives and never expose it to the internet. Microsoft Capicom 2.1 0.2 Download