Hi Magomet,

If you can find a way to convert them, you are free to use them in projects other than FPSC. The only restriction is you cannot pass the work off as your own (so give credit if the model pack includes the artist name), and also you cannot sell the models as single or collections of models, or include them in a game creator you create and sell. You can of course use them in your own games and can sell those games no problem. This is to protect the artist who would not like his hard work sold on as someone else's work.

Best Regards,
Lee