25 days later Asus still providing the wrong file in the ROG Gaming Center installer. (does not inspire confidence)
Our favorite German download site:
https://www.asustreiber.de/downloads/category/60-windows-10?start=20 is now providing a complete ISO download for the GL703GE.
This ISO contains the proper installer for the latest version of ROG Gaming Center V2.5.7 with the GL703GE .xml file, so it installs turbo gear.
Also contains: ROG GameVisual UWP {WILL INSTALL GAMEVISUAL} run Setup.bat as administrator.