Edit your soccer.ini file in your game directory and add the following lines for cheats, then run game as usual:
Unlock All Teams
CHEAT_UNLOCKED_TEAMS=1

Tournament Unlocked
UNLOCK_TOURNAMENT=1

Random Teams
CHEAT_RANDOM_TEAMS=1

Enable Auto Tackling
AUTO_TACKLING=1

Enable One On One Playmode
ONE_ON_ONE=1

Run Game In A Window
WINDOWED=1

Goalkeeper Becomes Very Good
ABSOLUTELY_PERFECT_GOALIES=1

Equal Team Stats
CHEAT_EQUAL_TEAM_STATS=1

Enable Aggressive Tackle Cheat
AGGRESSIVE_TACKLE_CHEAT=1

Enable Practice Mode
PRACTICE_MODE=1

Demo Mode
DEMO_MODE=1