1: Get a negation wand from somewhere, I think they can be found in bandit huts and the like as loot.
2: Kill all of the adult men in a village. It should say all the chests have been unlocked if all of them are dead.
3: Right click with the negation wand to remove the villagers.
4: Destroy all the buildings.
I clicked login, and then the screen asked me if I wanted to update. I clicked cancel and the bar gets stuck on "Checking for Technic SSP update" and none of the buttons are clickable. It works perfectly fine when I click yes.
The "Always use development builds" option is checked.