If your image editor is Corel® PaintShop™ Pro, our installer will automatically detect the editor on your system, and after installation (and a restart of PaintShop) AstroFlat Pro will appear in the PaintShop menus.
Open your image, then click on Effects and select Plug-ins. This will give you a list of all of your filter plug-ins.
In the list of filter plug-ins select ProDigital Software then click on AstroFlat Pro...