Recommended for most users. You can download the latest version (e.g., ngspice-46.tar.gz ) from the SourceForge rework releases folder .
Depending on your needs, you can choose between a stable "snapshot" or the active development branch: ngspice download source
For the absolute latest features (pre-master branch), use the following command in your terminal: git clone git://git.code.sf.net/p/ngspice/ngspice . Recommended for most users