The file:

  ripe-dbase-3.1.1.tar.gz 
  
Contains the complete 3.1.1 version of the RIPE Whois database server.

The file:

  ripe-dbase-3.1.1-nocxref.tar.gz 

Contains the 3.1.1 version of the RIPE Whois database server without the
cxref documents (located in the "doc" subdirectory).  If you do not use
these, then download the "nocxref" archive.

The file:

  patch-ripe-dbase-3.1.0-nocxref-3.1.1.gz

Contains a diff that can be used to patch the 3.1.0 "nocxref" release to 
3.1.1 "nocxref", if you would rather not download the entire release.