If you want to provide support or access your own devices remotely.
Sites like sigma4pc often host outdated or modified versions of software that can contain malware, spyware, or ransomware .
Downloading software from unofficial third-party sites like sigma4pc.com —especially in compressed formats like .rar —carries significant security risks. These files are often used by attackers to hide malware or bypass antivirus scans by password-protecting the archive. The Story of a Safe Download
TeamViewer regularly releases security patches. The latest versions (e.g., v15.x) include AES-256 encryption and two-factor authentication to keep your sessions private. Why RAR Files from Unknown Sources are Risky Free remote PC software: Connect anywhere - TeamViewer
If you just need someone else to help you; this doesn't even require installation.
If you are looking for , the most helpful and secure path is to use the official source.