```ruby
class TheUnarchiver < Cask
  url 'http://theunarchiver.googlecode.com/files/TheUnarchiver3.9.1.zip'
  homepage 'http://unarchiver.c3.cx/'
  version '3.9.1'
  sha1 'fc68b4b2a11560535ad055a464b48859186ba2d7'
  link 'The Unarchiver.app'
end
```

Upgrade The Unarchiver Cask to use SHA256
user
```ruby
class TheUnarchiver < Cask
  url 'http://theunarchiver.googlecode.com/files/TheUnarchiver3.9.1.zip'
  homepage 'http://unarchiver.c3.cx/'
  version '3.9.1'
  sha256 '34fa3410237e17b2cdceb801a84ed8db93c74ac0db551ffe65913c2134ebbf05'
  link 'The Unarchiver.app'
end
```
assistant