This is a German website that contains many of the Driver DVDs for many ASUS laptops. While the site is in German, use your browser translator to translate, the downloads themselves are in English.
https://www.asustreiber.de/downloads/download/60-windows-10/811-gl503ge-treiber-dvdDownload, extract all, mount the iso file, then copy all the contents to a file labeled eSupport. Then run AsInsWiz.exe (ASUS Installation Wizard) to install all your original ASUS drivers and programs. Also installed are many encrypted files that are required to run ASUS and third-party programs that were originally installed on your laptop.
I would strongly suggest you make a copy of your eSupport folder, separate from your laptop (DVD, USB, external hard drive, etc).
Good Luck
G752VSK, G75VW-3D, G51J, G1S
Homebuilt Windows Server