This is an Eclipse Update Site
To install the software hosted on this site, please use the Eclipse Update Manager.
To learn how to install software from an update site, please carefully read
Adding a new software site from Eclipse Online-Help and follow the instructions there.
However, JHipster IDE is also available in the Eclipse Marketplace. The easiest way to install it is to drag the following icon

on the start page into your Eclipse or open the marketplace dialog in Eclipse and search for
JHipster.