Download the game
This is the test build. It opens with the key you were sent.
- Open the file you downloaded and double-click Install Legends of the Lake.
- Windows asks first, because the game is new: choose Run, then More info and Run anyway.
- Your key is already in its box (if not, paste it). Press Install: it fetches the game, puts Legends of the Lake on your desktop, and you press Play.
After that the game keeps itself up to date: start it from the desktop and it takes any new build first.