The latest version it does not work button, this grey though this configured proxy

[fabriguzden]

[dpeng]

I don't familiar with QT, but after reading the author's code, found that design logic that, the author disable the "下载" button before init, and enable it again after the init done, and there has a key step in the init function that try to get response from"https://y.qq.com/portal/profile.html", and if the has no response, this button will keep grey.
According to the problem you met, i think you have something wrong with your internet setting.