Are you just getting the allgofree update error while still being able to play or the error and not able to play?
If it's just the first one, it should fix itself on its own eventually. If it's the second one, I guess you could try updating your java. I had the problem where the client couldn't reach the update server. The only thing that happened was the client background changing while still being able to play.
Note: I'm using the dl'able client.