Something you could try is to go to LW>Tools>Options>View>Popups and click the "Revert to default" button. But be aware, the next time you try to download a file you might be asked about "license". Make sure you click Yes when asked to download anyway.......
Look also under Filter>Configure Content Filter whether you've enabled the content filter. If so, disable it and click "Apply" (which you should always do when changing the configuration of LW before clicking OK)
