I found a fix that should help all of you!
C:\Users\Andrew\Documents\Elder Scrolls Online\live\AddOns\ <name of AddOn > \ <AddOn info>
This is the pathway everyone seems to have, but it never works right? I was working on this for a few hours last night and discovered that:
1. one of my AddOns was an empty file
2. there was a subdirectory in all the mods so the pathway was
C:\Users\Andrew\Documents\Elder Scrolls Online\live\AddOns\FoundryTacticalCombat\FoundryTacticalCombat\ <Addon Info>
I found that just by taking out the extra directory the Addon worked fine. So if you are still having problems check to make sure the file you downloaded is correct and there isn't a subdirectory