Hello, I tried a demo program and it worked well. However, there was a limitation. The developer told me that the paid version has no such limitation. I bought the paid version but it cannot do what the demo program does. The developer told me that I got the wrong version. I asked him to give me a refund first but no reply. It has been 3 days since I bought the app. Is there a way to get a refund? Compared with other typical apps, it is quite expensive. Thanks.