Havij has not been updated in over a decade. Modern Web Application Firewalls (WAFs) and patched database systems easily detect and block the specific injection patterns used by Havij, making it largely ineffective against modern targets.
The tool automates several complex tasks required to exploit a database: Analysis of the Havij SQL Injection tool - Check Point Blog Havij 1.16 Pro Download
Because it lacks the advanced detection logic of modern tools, Havij often reports vulnerabilities that don't exist (false positives) or fails to find vulnerabilities that are slightly more complex. Modern (and Safer) Alternatives Havij has not been updated in over a decade