These keys are stored in a file usually named prod.keys . When you run hactool, it immediately looks for this file to "unlock" the data you are trying to access. If it cannot find the file in the specific location it is looking, it throws the "does not exist" error.
Put prod.keys in the same folder as hactool.exe (Windows) or your home .switch folder (Linux/macOS). hactool prodkeys does not exist top
Leo pushed his chair back, the wheels screeching against the floorboards. He grabbed his phone and dove into the forums. He typed the error message into the search bar. These keys are stored in a file usually named prod
Once you have the prod.keys file: