Launch your protected software. If it runs without requesting a physical dongle, Multikey is working.
Version 18.1.1 of Multikey occupies a unique niche. It was released during a period when Windows 7 and Windows 8.1 were dominant, but early Windows 10 builds were gaining traction. Users and developers found that:
Windows requires all drivers to be digitally signed. Since MultiKey is often unsigned, you must bypass this: Open as an Administrator. Type bcdedit /set testsigning on and press Enter.