"Script error." and "Unable to complete version update. [30437]"
I was once able to click through the script error and to start the download/update but then the above-mentioned error occurred. I uninstalled FF14 from Steam, deleted the remaining folders as well as all temp files and cookies, deactivated all my browsers' (Firefox and Edge) add-ons and security, and restarted my PC to try it again - all that to no avail! Since my subscription has ended, I won't try to fix this to play the game anytime soon...
PS I've got a new SSD and a new Win11 installation; all my drivers are up-to-date.