The risks of data loss, malware infection, sudden deactivation, legal exposure, and complete lack of support far outweigh any short‑term cost savings. A “pre‑activated” Office 2019 Professional Plus is nearly always an illegal volume license key, a crack, or an outright scam. Microsoft Office 2019 Professional Plus Pre Activated --
The installation package runs a background script that automatically injects a stolen or leaked volume license key during setup. The Hidden Dangers of Pre-Activated Software