Manuel Jesús Bolaños Gómez & Davit Masiá Coscollar don't give f**k.
Their business strategy seem to be:
1. Release unfinished & buggy program based on sh**ty Game Maker Studio (in price rivalling professional software!)
2. Promise bug & feature updates to quickly get as many sales as possible
3. Stop supporting program, lie to users or completely ignore forums
4. Move on to next sh**ty GMS app, to quickly get even more money
So good luck getting anything out of this "developers". They already fooled me twice. First time when I bought Pixel FX Designer, second time when they convinced me on Steam forums that their intentions are good (after MONTHS of silence). I will never again buy anything from those people.
EDIT: All issues were fortunately resolved by developer in a very classy manner. I take back my accusations of ill will & lack of professionalism and sorry for them.
Those devs are honest people.