These repacks are typically created by third-party "cracking" groups. They reverse-engineer the official installer, extract the core binaries, patch the activation DLLs, and wrap them in a portable launcher (often using tools like "VMware ThinApp" or "Turbo Studio").
Article Title: DxO PhotoLab 9 — The Ultimate Powerhouse for RAW Editing Overview: Precision Meets Portability dxo photolab 9 portable exclusive