Downloads
From Wiki
Netgen/NGSolve for Windows
Netgen/NGSolve is available in compiled form.
The latest version of the installer is available from here: 32bit or 64bit.
If you don't have Microsoft Visual C++ 2010 installed, you have to install the redistributable package from here: 32bit or 64bit
Netgen/NGSolve for Linux
You have to compile Netgen/NGSolve yourself.
Latest release 4.9.14 is available from here: Netgen and NGSolve
Latest and greatest snapshots 5.0-dev is available from here: Netgen+NGSolve
Help for Debian/Ubuntu, or generic Linux
An automatic installation script by Alex P.: script
More information is available from here