Unfortunately, the Corel ActiveCGM Browser ActiveX Control is not available for downloading, at least not from public places, but based on its name I think it's available for installation only from the areas where Corel ActiveCGM is installed and the ActiveX is needed to access the content and the website.
I've looked on every possible website for additional details about it, but I didn't find anything available.
You have the possibility to contact Corel to obtain an official statement about this.