Download the TurboHUD.LightningMod program from https://turbohud.com.cn/ and install it on your local drive.
This program requires access to internet, you need to stay connected to internet.

Important:
Free version of the program has some limitations, many options are not available/adjustable.
You can get a license for version with full functionality at:
https://www.turbohud.com.cn/index.html#buyonline

Make an exception rule to your anti-virus software, to avoid downloaded file from being deleted. Include downloaded folder (where you download the program) in exception list of your anti-virus program.

Run installation file TurboHUD_LightningMOD.exe, this is self-extracted archive. Select the folder, where you want to install the program.
After installation completed, simply run TurboHUD_LightningMOD.exe from your installation folder.

Now you can bring new colors to your Diablo III game.
TurboHUD.LightningMod will open a lot of new opportunities and will change your gameplay.

*Remark:
When you first start the TurboHUD.LightningMod, it will automatically check for updates. Please allow automatic updates when TurboHUD.LightningMod ask for it, to make program to function properly. In addition, major game updates and patch releases require TurboHUD.LightningMod  to be properly updated.