On the PC I had this error and waited for an hour after patch and all the houses were sold after i did this...

I went to the folder C:\Games\SquareEnix\FINAL FANTASY XIV - A Realm Reborn\boot\
There is a file ending in .ver
I changed the permissions so that I could edit it.
in the file it contains a version number.
it ended ########.######.###.0001
I changed that last 1 to a 0.

Then i started the launcher this forced an update and it worked.

The Problem was that the internet I am using was cashing the file that the Launcher was checking against so it thought they were the same still. This fixed it.

I found that some people used a phone as a hotspot and configured there PS4's to use it for the update and that also worked.