```ruby
cask :v1 => 'unity' do
  version '4.5.5'
  sha256 'e42d3b8e3bc3fbc7448bb06b5210c1c0687ba3f784eb947b4586b9f129c6b0d4'

  url "http://netstorage.unity3d.com/unity/unity-#{version}.dmg"
  homepage 'http://unity3d.com/unity/'
  license :commercial

  pkg 'Unity.pkg'

  uninstall :pkgutil => 'com.unity3d.*'
end
```

Upgrade Unity to version 4.6.0
user
```ruby
cask :v1 => 'unity' do
  version '4.6.0'
  sha256 'ceeff727f8e66ebe00bd805468da27aa996bfcd5b3a455fe65516d9a2075a395'

  url "http://netstorage.unity3d.com/unity/unity-#{version}.dmg"
  homepage 'http://unity3d.com/unity/'
  license :commercial

  pkg 'Unity.pkg'

  uninstall :pkgutil => 'com.unity3d.*'
end
```
assistant