Has there been a fix for this?

I have purchased this for both of my Steam Accounts and get this message. I have tried everything including deleting the file mentioned and disabling the firewall. I have done this for both Steam Accounts on both computers and nothing has helped or fixed the issue..

I just purchased the game through Steam. I get a authentication failure upon start. I just looked through the settings and my Authentication Key is missing/blank.

The game defaults to DEMO MODE.

Any help would be appreciated.