I have seen similar threads where people have gotten script error when opening the games launcher. I am also getting these errors when launching.

=================================================
An error has occurred in the script on this page.

Line: 0
Char: 0
Error: Script error.
Code: 0
URL:

http://img.finalfantasyxiv.com/ft/ve...s?ver=20180312
http://img.finalfantasyxiv.com/ft/ve...s?ver=20180312
http://img.finalfantasyxiv.com/ft/ve...s?ver=20180312
http://img.finalfantasyxiv.com/ft/ve...s?ver=20180312
http://img.finalfantasyxiv.com/ft/ve...s?ver=20180312
====================================================

This is followed by black launcher window.

I have tried clearing out history + cache of edge browser and checked that there are no proxies enabled. I also tried 2 different ISP's and have the same issue on both.