Command & Conquer 3: Tiberium Wars does not have an official built-in "downgrade" feature. However, users often downgrade the game to or 1.08 because later patches (specifically 1.09) significantly altered unit balancing for multiplayer, which some players feel made certain campaign missions much more difficult.
If you meant "download features" or general game capabilities:
: A popular alternative to a full downgrade is using the "CNC3Original" mod . This mod restores the original 1.0 unit stats and campaign difficulty without requiring you to change the actual game files.