Abstract VMware Unlocker is a third-party utility designed to enable macOS guest operating systems on VMware Workstation and VMware ESXi hypervisors, which by default do not support macOS virtualization on non-Apple hardware. This paper examines the technical architecture of VMware Unlocker, its operational workflow, the reasons for VMware’s restrictions, associated legal risks (particularly regarding Apple’s software licensing), and legitimate alternatives for macOS virtualization. 1. Introduction Virtualization allows multiple operating systems to run on a single physical machine. VMware products are industry leaders for x86 virtualization. However, VMware intentionally disables macOS as a guest OS on non-Apple hardware due to Apple’s End User License Agreement (EULA). VMware Unlocker emerged as a community-driven tool to circumvent this restriction. Understanding its mechanics is important for system administrators, security researchers, and IT professionals evaluating cross-platform development or testing needs. 2. Background: Why VMware Blocks macOS Guests Apple’s macOS EULA states that macOS may only be installed on Apple-branded computers (e.g., Mac mini, MacBook, Mac Pro). VMware respects this license by locking macOS guest support to VMware products running on Apple hardware. On non-Apple hardware, the macOS installation option is hidden, and the VM will fail to boot even if manually configured.