The free license typically does not expire. However, you must log in once every 90 days to keep it active. Maltego will prompt you to re-authenticate via their servers.
The basic CE version is restricted from commercial, business-for-profit investigations. Lower Result Thresholds: Maltego Free License Key
Run the installer. Maltego requires Java Runtime Environment (JRE). The installer will usually prompt you to install Java if it is missing. The free license typically does not expire
If you have searched for a you are likely one of two people: Maltego Free License Key
This article will explain everything you need to know about obtaining a free license for Maltego, the difference between CE (Community Edition) and Classical licenses, and—most importantly—how to avoid dangerous malware masquerading as "key generators" or "cracks."