Since you can't buy it digitally, your safest legal options are:
: Look for used copies on eBay or Amazon for PC, PS3, or Xbox 360. Transformers: Revenge of the Fallen Free Download
Transformers: Revenge of the Fallen is officially and cannot be legally downloaded for free. Because the licensing agreement between Hasbro and Activision expired in 2017, the game was removed from all major digital storefronts like Steam, PlayStation Network, and the Xbox Store. Legal Ways to Play Since you can't buy it digitally, your safest