Most Multikey drivers are "unsigned" or use leaked test certificates. Windows will block the driver from loading by default. 💻 Memory Integrity (HVCI) A core feature of Windows 11 "Core Isolation."
from loading due to compatibility or security risks. Users frequently must disable Memory Integrity in Windows Security under Device Security > Core Isolation to allow the driver to initialize. Revoked Certificates (Code 39) Virtual Usb Multikey Driver Windows 11
Once your PC reboots with enforcement off, follow these manual installation steps: Virtual USB Multikey Driver — Windows 11 (Column)