"duplicate entry" indicates you've already got the entry in your database.
Without studying ALL the sql statements that your addon requires and comparing that against your live database, I can't tell you whether there are still steps that need to be run or not. But the error message certainly reveals that the entry that the script is trying to insert is already there. There may be more that haven't been entered but need to be.
You'll need to get down and dirty with checking every entry in your database against what that script is trying to do.