```ruby
class B9AerospacePack < Kosmos::Package
  title 'B9 Aerospace Pack'
  aliases 'b9', 'b9 aerospace'

  url 'http://www.mediafire.com/download/o6cbe03iitggj1p/B9+Aerospace+Pack+R4.0c.zip'

  def install
    merge_directory 'GameData'
    merge_directory 'Ships'
  end
end

class B9Aerospace0235Fix < Kosmos::Package
  title 'B9 Aerospace Pack - Fix for KSP 0.23.5'
  aliases 'b9 fix', 'b9 0.23.5 fix'

  url 'https://www.dropbox.com/s/8bjgxv65yshg2z3/B9%20KSP%200.23.5.zip'

  def install
    merge_directory 'B9 KSP 0.23.5/GameData'
  end
end
```

Add a package for the ModZero patch for B9.
user
```ruby
class B9AerospacePack < Kosmos::Package
  title 'B9 Aerospace Pack'
  aliases 'b9', 'b9 aerospace'

  url 'http://www.mediafire.com/download/o6cbe03iitggj1p/B9+Aerospace+Pack+R4.0c.zip'

  def install
    merge_directory 'GameData'
    merge_directory 'Ships'
  end
end

class B9Aerospace0235Fix < Kosmos::Package
  title 'B9 Aerospace Pack - Fix for KSP 0.23.5'
  aliases 'b9 fix', 'b9 0.23.5 fix'

  url 'https://www.dropbox.com/s/8bjgxv65yshg2z3/B9%20KSP%200.23.5.zip'

  def install
    merge_directory 'B9 KSP 0.23.5/GameData'
  end
end

class B9AerospaceModZeroFix < Kosmos::Package
  title 'ModZero B9 Aerospace Fixes'
  aliases 'b9 modzero fixes', 'b9 modzero'
  url 'https://www.dropbox.com/s/peq187l1ajc3mst/ModZeroB9Fixes.zip'

  def install
    merge_directory 'GameData'
  end
end
```
assistant