Pass to your opponent, and ensure he had the ball..try to look if the opponent player that had the ball didn't made a move try to pass it to another player (not often but usually after receive the ball they pass again to another team mate), pause and switch the player.. unpause and see if the player holding the ball had cursor on it.. if not immediately pause again and switch again to the original side before you made the switch you.. in my experience you have about two second to pause the game before crashing (if the cursor didn't move to the player holding the ball) and switch to original side before switching to avoid crash (it won't crash if you already pause it)..
I often got crash when using this trainer first time out .. but after few days and experiencing i managed to avoid the crash..btw how do you assigned hotkey to the trainer ?