Code 20524

[3Jane]

Whilst attempting to find the cause of persistent system crashed, I uninstalled FFXIV and I am trying to reinstall it.
All of the game except the update seems to go in as it should, but when it reaches the last part I get an error code: 20524.
I have tried three more complete uninstall / re-installs of the game, unfortunately I still get the error message.

I have turned off my AV/Firewall (Kaspersky) in case that was causing it, also I have made sure windows firewall and windows defender are off.

I have performed a few re-installations of this game in the past, however I have never seen this before.
Is there anything directly that I can do, or it it simply a matter of waiting until it passes and I stop seeing the error message.
Any advice would be extremely useful, thank you.

* Still trying, no luck. Both full re-installations and repeated attempts at the update.