Many "patched" versions circulating online are early builds of the game that lack newer levels, the "Tusk 'til Dawn" episodes, or official bug fixes.
These versions include all the episodes and sandbox levels that previously required an activation key on PC.
Modern versions of Windows (10 and 11) often struggle to run the original PC activation system, meaning even a "legit" key might not work without additional community fixes. The Modern Solution: Bad Piggies HD and Mobile
When Bad Piggies was originally released for PC (Windows and Mac), it followed a traditional "buy-to-play" model. Players would download a trial version and then enter a unique to unlock the full game, including all levels and the "Field of Dreams" sandbox.