Unfortunately when I load up the updated version of Blockland, it asks me to re-enter my key which when I do it states that it is an "Invalid Key.", this is the same key I have used since the release of Blockland and I, apart from the intial purchasing, have never experienced a problem, to my knowledge it has not been compromised. In my efforts to get my key to work I pressed the 'Retry' button, this was successful in authorizing the key and retrieving the name however my client still stated that I am on demo mode, so this leaves me to believe it could be problem with the client and not necessarily my key.
