There are several ways to install SVEditor:
DVKit is a combination of Eclipse, SVEditor, and other helpful plug-ins for design verification. DVKit is provided as installable packages and archives (.zip / .tar.gz) for Windows, Mac OSX, and Debian Linux operating systems. You can learn more about DVKit on the DVKit project page: http://dvkit.org
Download DVKit from the DVKit project page: https://sourceforge.net/projects/dvkit/files/
Once you have installed DVKit, your next step is to create an SVEditor project: Setting up an SVE Project
If you haven't installed Eclipse you can download it from the Eclipse website. There are a number of packages available. If you are unsure the "Eclipse IDE for C/C++Developers" is a good package to install.
SVEditor can be installed into an existing Eclipse environment via the Eclipse Marketplace.