Because MultiKey lacks a modern valid Microsoft certificate, you must temporarily or permanently disable digital signature verification.
To prevent your CAD/CAM software from losing its connection to the virtual key, ensure that your IT administrators do not push domain policies that force or turn off Test Mode via group policy objects (GPOs). If you plan on moving to a newer workstation, it is best to transition to modern cloud-based licensing or up-to-date hardware dongles supported natively by Windows 11. If you'd like, let me know: solidcam multikey fix
Follow these steps sequentially to cleanly remove the broken driver, bypass driver enforcement, and install the corrected MultiKey driver. Because MultiKey lacks a modern valid Microsoft certificate,
Note: If you ever need to disable this after configuring your environment, use: bcdedit /set testsigning off . If you'd like, let me know: Follow these