```ruby
class Texmacs < Cask
  url 'http://www.texmacs.org/Download/ftp/tmftp/macos/TeXmacs-1.99.1.dmg'
  homepage 'http://www.texmacs.org/'
  version '1.99.1'
  sha1 '418027afaf98b3a156c6076467efe6d57805a94c'
  link 'TeXmacs-1.99.1.app'
end
```

Update TeXmacs to use SHA256
user
```ruby
class Texmacs < Cask
  url 'http://www.texmacs.org/Download/ftp/tmftp/macos/TeXmacs-1.99.1.dmg'
  homepage 'http://www.texmacs.org/'
  version '1.99.1'
  sha256 'b6aab5bcb263e847c97062824b8852380cab4159306b035fcca199f92d243d51'
  link 'TeXmacs-1.99.1.app'
end
```
assistant