MultiKey 18.1.1 x64 typically refers to a virtual USB emulator
Verify system requirements
Driver Signature Enforcement: Disabling Windows integrity checks so the unsigned emulator driver can load. multikey 1811 x64 solidcam
Anti-Virus: Modern security software frequently flags MultiKey as a "HackTool" or "Trojan" and deletes the .sys driver file automatically. You may need to add an exception for that folder. MultiKey 18