Setup and requirements

Download latest release
Unzip to a folder of your choice (don't run exe from zip directly, as windows will put it into temp folder and delete after)
Run GHelper.exe

If you get a warning from Windows on launch (Windows Protected your PC). Click More Info -> Run anyway.
If you get dialog to Search for app in the Store, it's a hiccup of Windows Defender.
Right click on GHelper.exe select Properties and select Unblock

It's not recommended to use the app in combination with Armoury Crate services, because they adjust the same settings. You can uninstall it using AC own uninstall tool. Just in case, you can always install it back later.
It's not recommended to have "ASUS Smart Display Control" app running, as it will try to change refresh rates and fight with g-helper for the same function. You can safely uninstall it.
If you don't plan to use MyASUS you can stop it’s services. Go to Extra in the app and press Stop in Asus Services section. To start services back - click Start instead.
It is strongly recommended to run app with windows default "balanced" power plan