(meaning unable to load launcher) Try this, per others who are a lot smarter than me--cause it worked:

If you having problem on PC i suggest this that i saw on reddid:

- Go to(your FFXIV game file):
\Documents\My Games\FINAL FANTASY XIV - A Realm Reborn

Open this file: FFXIV_BOOT

Change this value here from 0 to 1:
BootVersionCheckMode 0

If PS4 player... dunno >_> sry.