Garageband "was not able to complete the download"
Garageband '11 version 6.0(427.17) has several pending "learn to play" lesson downloads awaiting completion. When I try to resume these downloads I get the message "Garageband was not able to complete the download." It directs me to the apple help page, which is not at all helpful. This error comes up whether I manually attempt to resume the downloads, or if they resume automatically when Garageband restarts. At this point, I am unable to download any lessons at all (even, for example, piano lessons which are not currently pending). I have tried everything suggested in the support discussions - nothing worked. Does anyone have any other suggestions? Might uninstalling Garageband and reinstalling it work? Do I need to find a way to permanently delete the partial lessons first?
GarageBand (Mac) '11, Mac OS X (10.6.3)