Looking at the Data::Dump::Streamer distribution itself, it contains more files, so my guess would be that the problem lies elsewhere. I would manually download DDS from search.cpan.org and then look if the tar utility unpacks the file properly. My guess is that your tar utility is a tar which doesn't understand the .tar file that has been uploaded. I guess that GNU tar understands both, plain old tar (which is what demerphq uploaded I guess), POSIX tar extensions and GNU tar extensions.