Oh, and sometimes software like SketchCut requires an account. So the user might need to create an account and log in before applying the key. Including steps for account creation could be helpful.

First, they should download the installer from the official website. Then install the software. After installation, during the first run, they might need to enter the activation key. If it's after installation, they'd find the activation option in the settings or account menu.

Wait, but the user is asking specifically about "install." So maybe they need to install the app first, then activate it. Need to separate the installation steps from the activation. Also, maybe the activation is part of the installation process. Clarify that depending on the purchase, the activation key is applied during setup.

Wait, but maybe the user has a separate key and needs to apply it. Sometimes keys are for upgrades or specific versions. Need to confirm that they have the correct key and software version. Also, ensure they are on the right platform, like Windows or Mac, as installation steps can differ slightly.