"Gmail Password Hacker V.2.8.9" is not a legitimate tool; it is a designed to infect your computer rather than "unlock" an account.
If you have forgotten your Gmail password or are having trouble accessing your account, there are alternative and legitimate ways to regain access: Gmail Password Hacker V.2.8.9 Software Unlock Key
to check if your saved passwords have been compromised or need updating. Security Checkup: If you suspect unauthorized access, run a Google Security Checkup to review active devices and recent security events. How to Protect Your Account Enable 2-Step Verification: "Gmail Password Hacker V