Twierdza RPG Maker Polska is not a sales website. We are an informational site about the aforementioned engine, interesting graphic resources, tutorials, and so on. Many users still use RPG Maker 2k, which is compatible with the 16x16 resolution of your works. Our editorial team is happy to inform users about interesting resources, but only if we can offer a free demo for download on the site. Well, if you don't want to expand your reach to the Polish community, we understand. Thank you for your time and I wish you good luck.
Personally, I would like to add that I bought a graphics pack for my game, and it's great.