The UART Driver for the ASUS VivoBook 15 X512FA is the same UART driver which is used by other products from Asus which uses the Intel Whiskey Lake hardware. These are also found in other products such as the UART for VivoBook Pro 15 N580GD as well as the UART for VivoBook 15 F512DA and the UART for VivoBook 17 F712FA. these all use the Whiskey lake hardware from Intel as an I/O UART controller so their drivers will all be the same.
ASUS VivoBook 15 X512FA UART Driver
The UART Driver can be install by clicking on the install file or right-click on the inf file and then click on install. There is also the option to install the UART driver via the device manager in Windows 10 which would be the easiest. You can simply extract the files into a directory and then you can point the device manager update driver to the directory where you extracted the files. It will install from there. The ASUS VivoBook 15 X512FA UART Driver works on Windows 10 and a 64bit system.