Most trainers for Red Alert 3 v1.0 operate on a similar principle. While specific steps can vary, the general process is as follows:
A: No. You need a trainer specifically built for your version (1.04, 1.12, etc.). red alert 3 v1.0 trainer
Grants infinite health to your selected units or entire army. Most trainers for Red Alert 3 v1
If you are playing on Steam or EA App, you likely have version 1.12, and a v1.0 trainer will cause the game to crash. you likely have version 1.12
Which you are currently playing (Soviets, Allies, or Empire?)
If your game crashes immediately upon pressing a hotkey, it means your game executable does not match the exact v1.0 build the trainer was programmed for. Double-check your patch history or try an alternative trainer creator.