Haha. Yes, I was having the same issue.
I did what anyone should do during an update (Which is update the build)
Start the launcher, go to options, click on manual build selection(Make sure it's checked), and then click on the build. I know there is only one at the moment, but click it anyways. When you are done, hit 'ok'.
Launch your game and it should start the update, you should get a little 'hello' box, and then it should launch just like any other technic version.
Hope this helps!