Introduction:
Windows 10 enforces driver signatures by default. This is required for security of the system. Windows device installation uses digital signatures to verify the integrity of driver packages and to verify the identity of the vendor (software publisher) who provides the driver packages. For Windows 10, drivers must be signed by the Windows Hardware Dev Center Dashboard, which requires an EV certificate.
However, for some reason, you might need to install drivers that are not digitally signed. You can disable to install drivers that are not digitally signed. The following WiKi article is based on Windows Insider Preview Build #18219 (Skip Ahead).
According to Microsoft Windows uses a valid digital signature to verify the following:
bcdedit.exe -set loadoptions DISABLE_INTEGRITY_CHECKS
bcdedit.exe -set TESTSIGNING ON
bcdedit -set loadoptions ENABLE_INTEGRITY_CHECKS
bcdedit -set TESTSIGNING OFF