Yes, the Offline Viewer is safe to use. Many anti-virus or security programs may give warnings and browsers may do so also. In most cases, you may tell your anti-virus program, browser or computer that you trust the program and to download it.
If you have additional questions, please submit our support form or contact us by phone at 1-888-242-5536. We offer free, live, US-based support Mon – Fri, 8am – 5pm CT.