The Elder Scrolls Online

The Elder Scrolls Online

macOS: Does the Launcher app contain any of my account data?
Here's the situation. The game launches fine for me but for someone else, also a mac user who bought ESO on Steam, the launcher fails. They've tried everything they could and are now asking me whether I can send them my launcher, which works at least for me. I wouldn't mind as long as it's safe for both of us, but is it?