A callback for downloading files
@param url the URL of the file to be downloaded
@param localpath the directory to which the file should be downloaded
@param force whether to force an update, even if the file is the same
@return 0 on success, 1 if the file exists and is identical, -1 on
error.
A callback for downloading files @param url the URL of the file to be downloaded @param localpath the directory to which the file should be downloaded @param force whether to force an update, even if the file is the same @return 0 on success, 1 if the file exists and is identical, -1 on error.