```ruby
class Josm < Cask
  url 'http://josm.openstreetmap.de/download/macosx/josm-macosx.zip'
  homepage 'http://josm.openstreetmap.de'
  version '6388'
  sha1 'b7973548df871e7d7edd6f14bd0953f4786fae5a'
  link 'JOSM.app'
end
```

Change Cask for proper use of version-less download URL
user
```ruby
class Josm < Cask
  url 'http://josm.openstreetmap.de/download/macosx/josm-macosx.zip'
  homepage 'http://josm.openstreetmap.de'
  version 'latest'
  no_checksum
  link 'JOSM.app'
end
```
assistant