I have just returned from work to see the improvements after the maintenance: Tera Germany Awakening runs OK, Tera Europe Classic does not go past the server selection screen. Both were running OK yesterday.
Windows 11 Home, version 24H2
Edit: Fix - use the older launcher for Classic. It starts with the launcher dated 02/08/2025, but does not start with the new one dated 23/08/2025.