Place the trainer file in your Red Alert 2 installation folder (e.g., C:\Program Files (x86)\EA Games\Red Alert 2 ).
Disclaimer: Third-party trainers are created by independent developers and may be flagged by security software. Use them at your own risk. If you'd like, I can: red+alert+2+trainer+1006
Always back up your save files before using a trainer. Place the trainer file in your Red Alert