🚀 go-pugleaf

With Reader 7, I have the Problem, when scrolling down a document and then scrolling it up again, the font changes and then I couldn't read anything, because the fonts width is too narrow (don't know which font it is then). So I tried to install Reader 8. But it doesn't work. I tried to uninstall and reinstall it several times. But I always have the same problem. When trying to start the program first, I should accept the license. But I couldn't accept the license. Klicking on the accept-button, it takes no effect. Trying to change the language, it takes no effect. Trying to decline the license or to save or print it - no effect. It always just shows, that the button is clicked. But nothing else happens. The only thing that works is clicking on the cross in the right upper corner. But by doing it, the program closes, as it should, but I couldn't use the program. What should or could I do?