Rovio officially stopped developing and selling the PC/Mac versions in 2014 to focus on mobile platforms.
When Rovio Entertainment released Angry Birds in 2009, no one predicted it would become a global phenomenon. But just a few years later, in 2012, Rovio decided to flip the script. Instead of slinging birds at green pigs, they asked a brilliant question: What if the pigs were the heroes? Bad Piggies Full Game Activation Key
Many users on forums like Reddit suggest using an Android emulator like BlueStacks to run the mobile version on a PC, which avoids the activation key requirement entirely. Community Workarounds Rovio officially stopped developing and selling the PC/Mac