title: nltk data out of date
body: <p>I have installed NLTK on my machine... after that I am writing the following block of Python code...</p>
  
  <pre><code>import nltk
  nltk.download()
  </code></pre>
  
  <p>After that a GUI opens which shows the packages/corpora that can be downloaded...
  there are 3 headings respectively</p>
  
  <pre><code>all                  out of date
  all-corpora          out of date 
  book                 out of date
  </code></pre>
  
  <p>as a result i am unable to download from the book identifier... any help will be really appreciated.</p>