Even if he would update it right now, you wouldn't have much fun playing it. I just updated my private server and it runs so badly
It's probably his leaf decay code again, like the last time... I don't get why he isn't adding the leaf decay mod from a user because that one was perfect.
Hope he can release a "bugfix" soon. He REALLY needs people to try his stuff before sending it out. Things like this just gives him a bad reputation which is quite bad