Limit your trainer usage strictly to offline Skirmish modes and the single-player campaigns to avoid getting banned from community multiplayer platforms like GenTool or CNCOnline.
These mods usually require patch 1.04 or 1.06 as a base and can breathe new life into the game without the need for an external trainer. Command And Conquer Generals Zero Hour Trainer 1.06 - Google
Where to safely download to fix modern resolution issues. Limit your trainer usage strictly to offline Skirmish
Launch Command & Conquer: Generals – Zero Hour (ensure your in-game menu verifies you are on version 1.06). Command And Conquer Generals Zero Hour Trainer 1.06 - Google