Edit your soccer.ini file in your game directory and add the following
lines for cheats, then run game as usual:

Text                                                 Description

CHEAT_UNLOCKED_TEAMS=1        Unlock All World Team, All Americas Team, All Asia Team And All Europe Team
UNLOCK_TOURNAMENT=1             Unlock Tournaments
AGGRESSIVE_TACKLE_CHEAT=1   Enable Aggressive Tackle Cheat
CHEAT_EQUAL_TEAM_STATS=0     Equal Team Stats
CHEAT_RANDOM_TEAMS=1            CPU Selects Random Teams
DEMO_MODE=1                               Run Game In Demo Mode
WINDOWED=1                                 Run Game In A Window