GOG (formerly Good Old Games) offers a DRM-free version of the game:
Obtaining Transformers: Revenge of the Fallen for PC today can be a bit of a nostalgia trip, but it requires knowing where to look since the game was delisted from major digital storefronts like Steam and the Activision store years ago [3, 4, 6]. The Legacy of Revenge of the Fallen on PC transformers revenge of the fallen download pc
Since the game was built for older hardware, you may encounter crashes or "DLL not found" errors. GOG (formerly Good Old Games) offers a DRM-free