```ruby
class Appcleaner < Cask
  url 'http://www.freemacsoft.net/downloads/AppCleaner_2.2.1.zip'
  homepage 'http://www.freemacsoft.net/appcleaner/'
  version '2.2.1'
  sha1 'd52dfbed9903799d21753be7fdd229c7277fba2a'
  link 'AppCleaner.app'
end
```

Switch AppCleaner to no checksum
user
```ruby
class Appcleaner < Cask
  url 'http://www.freemacsoft.net/downloads/AppCleaner_2.2.1.zip'
  homepage 'http://www.freemacsoft.net/appcleaner/'
  version '2.2.1'
  no_checksum
  link 'AppCleaner.app'
end
```
assistant