Windows 8.1 "All-in-One" (AIO) versions are typically unofficial community-made ISO files that bundle multiple editions (Pro, Home, Enterprise, etc.) and architectures (32-bit and 64-bit) into a single installer
> Activating Deep Core Kernel...
List of Generic KMS Client Keys (for education/activation via your own KMS host): windows 8.1 aio
Choose "Custom: Install Windows only (advanced)" to format your drive and create a fresh installation. Configuration: Windows 8