It's possible to use FM13 editor, and it's still possible to just create a boost_team.edt file in the steam apps section to edit the game at this stage, but I'd say that the likely thing he did was pay in monthly installments, along with the possibility of altering the wage budget to boost the transfer budget. The difference in finances (30 Million start, 45 million brought in through sales, 120 Million spent, so 47 million brought in out of, seemingly, nowhere) could be attributed to him setting the target for the season to be 'win the title' and not to be 'a title challenge'. That can bring in quite a bit (last year, it was 20 million by itself), and the wage budget could, realistically, be used to bring in 15 million or so. Plus, as was said, he could ask the board to increase the transfer budget to suit his needs.