I have my new Rog Strix Z370-i installed, but dont have an external disk drive for my itx case yet. This software is advertised for this board too, but its not available for download on the product page:

https://www.asus.com/uk/Motherboards/ROG-STRIX-Z370-I-GAMING/HelpDesk_Download/

Well I found an alternative download from a third party website, but surely this should be on my motherboard's link above.