Download the installer. During setup, you will be prompted to enter your name and the license key. Copy-paste it exactly as provided. Modern versions activate instantly online and can also be activated offline via a license file.
Amiga Forever (specifically versions 6 and later) moved away from simple serial numbers. Modern versions use online activation, hardware fingerprinting, or unique license files tied to your Cloanto account. The days of a universal AMIGA-1234-ABCD key are long gone. Most "keys" you find online are either: amiga forever license key
Forget the cracks. Here is how to legally obtain a license key that works forever. Download the installer