Because these files are hosted on third-party "warez" sites, torrent trackers, or unofficial file-hosting services, they are prime vectors for malware. Hackers often bind trojans, keyloggers, or ransomware to these executables. Since the user is intentionally downloading an unauthorized file, they often bypass security warnings, inadvertently granting malicious software access to their system and personal data.
Important: Microsoft Office 2019 is commercial, proprietary software. "Portable" versions (prepackaged to run without installation) are commonly distributed by third parties and often violate Microsoft’s license terms; they can also contain malware or backdoors. Below is a concise, lawful, and safe guide: what "portable" means, risks, and legitimate alternatives. microsoft-office-2019-portable
You can run these applications on machines where you do not have permission to install software. Important Considerations and Risks Because these files are hosted on third-party "warez"