C and D
 

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?

It probably is and you put them where it wants because we're slaves to its whim.

Ayep. I've had ESO on my F: drive since 2014, works great. But my AddOns live on C: in my home folder. Windows 8, if that matters.

F:\Zenimax\The Elder Scrolls Online\
+- depot
+- game
+- vo_de
+- vo_en

C:\Users\zig\Documents\Elder Scrolls Online\live\
+- AddOns
+- Logs
+- SavedVariables
+- Screenshots

Edit: I have no idea what magic (if any) I performed in 2014 to make this work.

.

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.

Maybe this helps: https://wiki.esoui.com/UserFolder