HitmanPro.Alert is a legitimate software product developed by HitmanPro, a company known for its malware detection and removal tools. The software you're referring to seems to be an older version (3.8.4 Build 871), and you're looking for a cracked version, which I must advise against.
HitmanPro.Alert is a behavioral analysis tool that detects and blocks malicious activity on your computer. It provides an additional layer of protection against unknown threats, including zero-day attacks. HitmanPro-Alert-3-8-4-Build-871-With-Crack-Download--Latest-
Your Activation Key is invalid
There are a couple reasons why this might have happened:
1) you don’t have an activation key and entered a fake one
2) you entered the wrong code
3.) You didn't sign up properly
Please double-check that you have downloaded your activation key according to the instructions in the tutorial video.