```ruby
class Sketch < Cask
  url 'http://www.bohemiancoding.com/download/sketch.zip'
  homepage 'http://www.bohemiancoding.com/sketch/'
  version 'latest'
  no_checksum
  link 'Sketch.app'
end
```

Update URL for Sketch 3.0
user
```ruby
class Sketch < Cask
  url 'http://bohemiancoding.com/static/download/sketch.zip'
  homepage 'http://www.bohemiancoding.com/sketch/'
  version 'latest'
  no_checksum
  link 'Sketch.app'
end
```
assistant