6.6.1 is still supported - only the 5.x series is not supported.
While I can appreciate that getting the board fixed is your highest priority, there's little we can do without looking at the installation.
Because you really *do* need to have your license information on hand if you're going to run the software, (you should be able to present it at any time, if necessary), I would encourage you to submit a ticket, let us help you find the license information, and then let us help you fix the board.
You can try
this ticket type instead, which won't require license information.
