It should be like minecraft: when you open blockland, before you go to menu, it asks you to opdate or go to menu. And in options, you can activate or disactivate the update page. That's how it should be, not re-download blockland and try figuring out how it works (like update of V19 to V20 is like a puzzle I can't solve). It' would much easier, you could keep your add-ons, saves, screenshots, etc... without transfering them!