Quote Originally Posted by Kyomen View Post
Would you mind going over how to reinstall for me? I tried that once, but it got to the point where I couldn't reinstall heavensward because of the exact same error. This prompted the system restore.
Uninstall the game as normal, go to the root directory it was installed into, use the shortcut (properties) to find the location, delete any remaining files, go to My Documents (on pc) and then My Games in there you will see a FFXIV Folder delete it and install the game again.

This worked for me can't help you with none pc platforms since i don't have them.