The installation process for cables C and D is identical to the standard version: Extract Files:
Note: Always download audio drivers from the official source to avoid malware or adware.
While the base driver is provided as freeware (donationware), the additional VB-CABLE C & D drivers are specifically distributed as donationware for download via the VB-Audio Webshop . This report outlines the official acquisition process and technical details for these drivers. Product Overview
This is mandatory. Without a restart, the virtual cables won’t appear in sound settings.
You must restart your computer for the new virtual devices to appear in your sound settings. Why use C and D instead of just one?
However, a workaround if you need more than 1 virtual cable for free: