```ruby
class Mou < Cask
  url 'http://mouapp.com/download/Mou.zip'
  version 'latest'
  homepage 'http://mouapp.com/'
  sha1 'e69bc2bbdadea6a2929032506085b6e9501a7fb9'
end
```

Use `no_checksum` instead of a sha1 when getting `latest` version.
user
```ruby
class Mou < Cask
  url 'http://mouapp.com/download/Mou.zip'
  version 'latest'
  homepage 'http://mouapp.com/'
  no_checksum
end
```
assistant