I've installed my ESO and Addons on my D drive but when I open the game there are no visible addons available. Is the game looking for the C drive? How do I remedy the situation?
That's how it automatically gets installed for me. I put ESO on my D drive and the addons automatically get a folder created in my user documents on my C drive.
If the installer put the addon folder on another drive, you ought to leave it there, I imagine, and not attempt to move it elsewhere.