Permanently disable driver signature enforcement in Windows 8.1
For some unsigned driver, you must disable driver signature enforcement to make it work. In Windows 8.1, this operation requires a reboot. And the settings is not permanent. It will backed to default enabled after turning on again or restart normally.

Through search, I found the program Driver Signature Enforcement Overrider from the post Permanently disable driver signature enforcement on Win 8.1 x64. It could disable driver signature enforcement permanently.

Although there is no Win 8.1 in its Supported OS list, it could work. Just follow its built-in instructions:

So how do I use it?
First and foremost; you are using this software at your own risk, we do not
take responsibility for any damages to your system, but we do not believe it
can harm anyone anyway. Secondly, User Account Control (UAC) must be
disabled in-order to use this tool as well.

1. Go ahead download and launch the application from the link below. Inside
its main menu, press on the "Enable Test Mode" button and follow the
instructions on the screen. This will enable TESTSIGNING mode, which
allows unverified system files to be loaded.

2. Now all you have to do is to add the unverified signature to the required
system files. To do so press on the "Sign a System File" button from the main
menu, and enter specific filename including full path. For example: if
ATITool64.sys from C:\Windows\System32\drivers refuses to load due to
driver signature enforcement, you should type: "C:\Windows
\System32\drivers\ATITool64.sys", and if you would like to sign more than a
single file, just repeat this procedure until you’re done, and finally reboot.

After you enabled Test Mode and added signatures to the required system
files, they should bypass Windows’s driver signature enforcement and load
without any issues. However, if for some reason you are interested to revert
it, you can re-launch the application, choose "Disable Test Mode" from the
main menu, and reboot. If you encounter issues or having questions, feel free
to post it on our forums.
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