The official patch history addresses the core issues players try to fix with manual downloads. The Definitive Update

ShadowOfWar.exe is the main executable file that launches the game. It's located within the game's installation folder.

Update 1.21 is automatically integrated into the Shadow of War: Definitive Edition and standard versions on Steam and GOG. There is no need for a manual executable.

: On higher difficulties, the game previously replaced killed Warchiefs too aggressively. Update 1.21 tuned this behavior so "power vacuums" persist for a more balanced duration. Expansion Bugs