Intenta haciendo esto, a mi me funcionó.
Download and Try to Install the Bethesda Launcher. If it fails try this:
Its actually locally stored at (Similar will vary with time):
C:\Users\<UserName>\AppData\Local\Temp\I1449987112\
After that go to:
C:\Users\<UserName>\AppData\Local\Temp\I1449987112\InstallerData\Disk1\InstData
There you will find a Resource1.zip
Extract it there only. And then go to:
C:\Users\<UserName>\AppData\Local\Temp\I1449987112\InstallerData\Disk1\InstData\Resource1\$IA_PROJECT_DIR$\src_path
Here you will Find a folder called "Launcher"
Copy the Launcher folder into your Zenimax Online Folder and run the Game from Steam.
This will work.
Saludos,
