As seen in the video by GamerPillar, you will need to scale the High Keep in order to find the evidence to accuse Harlow in Hogwarts Legacy. To begin the climb, head on over to the far right of the castle wall. There is a wooden platform leaning up against the castle wall. Walk around to the left, where a gate has a mechanism beside it. Use Depulso on the mechanism to open the gate. The gate will stay open. Next, use either the Accio or the Wingardium Leviosa spell to move the crate inside the gate back to the breaking wall where you first climbed up.