```ruby
class Xact < Cask
  url 'http://xact.scottcbrown.org/xACT2.27.zip'
  homepage 'http://xact.scottcbrown.org'
  version '2.27'
  sha256 'a99965cc9c34838b2492dd99a5d5419123132b5eae30b7db5be14fc095750135'
  link 'xACT 2.27/xACT.app'
end
```

Update xACT 2.27 to 2.28
user
```ruby
class Xact < Cask
  url 'http://xact.scottcbrown.org/xACT2.28.zip'
  homepage 'http://xact.scottcbrown.org'
  version '2.28'
  sha256 '0296e366f6b7f0a35ef6d1707695b67b8299efa678071f82a877000f4587d3d3'
  link 'xACT 2.28/xACT.app'
end
```
assistant