The Professional version adds several advanced features that streamline high-level networking labs:
EVE-NG Professional is the premium version of the popular multi-vendor network emulation tool. Unlike the Community Edition, the Professional version is and requires a unique license key tied to your specific hardware or virtual machine.
license key for free outside of official promotional contests, you can use the EVE-NG Community Edition , which is completely free and open-source. Free vs. Professional Comparison
: EVE-NG Pro uses a specific "License Request" code generated by your unique hardware. A generic "free key" found online will not match your system's hardware ID.