Is really easy to get it...
Let me explain.

In my case with my G750JS.
1º Download the lastest Asus Realtek HD Audio Drivers (200Mb): Audio_Realtek_Win81_64_VER6017469.zip (This is the last version available for G750JS)
2º Make sure your Laptop is in Airplane Mode (this prevent Windwos 10 for reinstall the new driver during reinstalation of the old driver).
3º Unpack the ZIP file to a temp folder in C:\ (for exmaple Downloads folder).
4º Run the Setup.exe file inside the unpacked folder.
5º Your driver will uninstall the New drivers, after uninstall the setup ask for a reset.
6º After restart of Windows (login in your windows) the Realtek will continue with the setup installing the old driver.
7º When the installation complete, need another Reset, let it.
8º When restart complete and you login again in your Windows 10, you can see the new icon in the desktop (AudioWizard).
9º Open Search bar and search for Realtek, open the Realtek Audio Admin
10º Check if the Audio Wizzard Launch icon appears in Realtek Audio Admin, Open it and check if MaxxAudio Works. If not works, go back to point 2.
11º If all works and not problems, now open Computer Management (Windows+X), and Device Manager, under Sound, Video and game controllers Right Click on Realtek High Definition Audio, and select Update Drivers, Select Automatic. Windows 10 begins to download the new driver, after complete and installed, restart your Computer.
12º Now... you have MaxxAudio and lastest Realtek Audio Drivers with DirectX12.

Thanks to aframo to get the first person to get this working!