Version 4.16.0 is now considered an outdated build. Hackers and automated bots often target specific older versions because:
Once a vulnerability is discovered and patched in a later version (like 5.x or 6.x), the "fix" acts as a roadmap for attackers to exploit those who haven't updated yet.
Security is a moving target. While Nicepage 4.16.0 offered great design features for its time, its known vulnerabilities make it a liability in the current threat landscape.