If you are getting Fatal Error 6 in the launcher, please try the troubleshooting steps listed below.
REPAIR THE ESO LAUNCHER
Open The Elder Scrolls Online Launcher by right-clicking on the icon on the desktop and selecting Run as Administrator.
Wait for the launcher to open completely.
If multiple ESO clients are installed and available through the launcher, make sure you have the correct version highlighted by clicking on it once.
Open the Game Options dropdown menu and click on the option for Repair.
Allow the launcher to examine all the files for the game. This may take some time.
If any files are found to have problems, the launcher will re-download those files.
DELETE THE ESO LAUNCHER FOLDER
PC: Go to the Launcher folder and delete it.
You can find this by default at C:\Program Files (x86)\Zenimax Online\Launcher.
DOWNLOAD NEW ESO LAUNCHER
Once you have deleted the folder, download the ESO Launcher from your account management page here to reinstall it. You can do this by logging in to your account on our website and clicking the Download Game button on the page for your appropriate platform.
If you play on Steam, download a new copy of the game through Steam.
Thank you for the reply. I tried the troubleshooting steps but the problem was embedded in the directory. I uninstalled and reinstalled the game which fixed the issue. The fatal error 6 did not occur with the PTS test client.