It's in a chest. If you already opened the chests before the update, talk to the Orc next to your house and use "Save Fix". After that the chests will be resetted so you can open them again and find the blueprint.
I seem to have an issue at the fairy stuck in the tree, at the very beginning of the game. It gives me an error that says "Uncaught TypeError: Cannot read property "width" of null". Any suggestions on how to solve it?