While not necessarily safe to allow non-standard/unsigned or development drivers on a system, one may do that in test mode. This is how you do (or undo) test mode in Microsoft Windows 7 and newer (including Windows 10).
Open an Administrator command prompt and enter this set of lines:
bcdedit -set loadoptions DISABLE_INTEGRITY_CHECKS bcdedit -set TESTSIGNING ON
To turn it back off, and revert to normal is the same way in reverse:
bcdedit -set loadoptions ENABLE_INTEGRITY_CHECKS bcdedit -set TESTSIGNING OFF
Reboot and you are back to normal.