Ah, this is a good sign. No idea why the confirmation dialog never came, but as the second line contains “device” it doesn’t seem necessary (usually it would show “unauthorized” if you haven’t permitted access; “unauthorized” would be a problem).
If the installer says that your phone is compatible that’s also good. The files to be installed only need to be downloaded once. So consecutive runs of the installer won’t download again, i.e. this is not an indication of a problem. 
I don’t have a Samsung myself so I don’t know about the steps that follow. But the installer creates a logfile each time it is executed. That might contain information where it hangs/can’t proceed.
Details are in Howto troubleshoot issues with the easy-installer