Hi Girdhari,
alternatively, ensure Kepler (or Juno, depending on your installed HANA Studio version) and Xtext are visible as update sites
- Kepler: http://download.eclipse.org/releases/kepler
- Xtext All In One - Release: http://download.eclipse.org/modeling/tmf/xtext/updates/composite/releases/
See the note in the above mentioned document.
Cheers,
Jasmin