Do not download "activation tools" from unofficial sites. They are almost certainly scams or viruses. The official Steam or Developer versions are the only way to play the game securely on modern hardware. official download links for the different versions, or are you looking for gameplay guides to help you beat the harder levels?
You will find communities on Reddit (r/abandonware) and MyAbandonware who have archived the "Activation Unlocker" files. Specifically, look for chicken_invaders_3_v1.0_reflexive_crack.zip —though note that modifying the .exe is legally distinct from using a code. chicken invaders 3 activation code reflexive
. This version does not require the defunct Reflexive wrapper. Do not download "activation tools" from unofficial sites
If you are looking for a legitimate activation code today, it is recommended to use official modern storefronts that provide updated, compatible versions of the game: official download links for the different versions, or