@Uwe:
You need to have selected in µTorrent > Options > Preferences > UI Settings > When Adding Torrents "Show options to change the name and location of the torrent data".
In my version of uTorrent 3.0 the box to check reads "Show a window that displays the files inside a torrent in advanced mode"
This will show a dialog as attached below. Choose 'Select none' and that clears the check boxes. Then you just click the boxes of those you want to download
🙂
utorrent.JPG