If you are interested in how viruses work, downloading a 15-year-old "maker" tool isn't the best way to learn. Modern cybersecurity has evolved, and "signature-based" viruses created by tools like TeraBIT are caught instantly by Windows Defender.
Always use software like VirtualBox or VMware to isolate your experiments from your main operating system. Download TeraBIT Virus Maker
Creating and distributing malware is illegal under various international laws, such as the Computer Fraud and Abuse Act (CFAA) in the US. Even "pranking" a friend can lead to serious legal trouble or permanent bans from ISPs and online services. Modern Alternatives: Ethical Hacking If you are interested in how viruses work,
TeraBIT is a legacy "malware construction kit." These types of programs were popular in the mid-2000s and early 2010s. They provided a Graphical User Interface (GUI) that allowed users—often "script kiddies" with little coding knowledge—to create executable files (.exe) designed to perform malicious actions. Common features included in TeraBIT builds were: Creating and distributing malware is illegal under various
These platforms provide legal, sandboxed environments to practice "red teaming" (offensive security) without risking your own hardware or legal standing.