Only download software from the official manufacturer's website or a trusted archive. Downloading "cracks" or "keygens" for security cameras is a major security risk—you are essentially inviting malware onto the very system meant to protect you.
Then navigate to the official support site. Never trust executable files from unknown forums or “tool aggregator” websites.
I can provide the specific download link and step-by-step instructions for your exact device. HIKVISION IP camera password Reset/Unlock using SADP tool