2. Install LAMMPS

You can download LAMMPS as an executable or as source code.

With source code, you also have to build LAMMPS. But you have more flexibility as to what features to include or exclude in the build. If you plan to modify or extend LAMMPS, then you need the source code.

• 2.1. Download an executable for Linux
• 2.2. Download an executable for Mac
• 2.3. Download an executable for Windows
• 2.4. Download an executable for Linux or Mac via Conda
• 2.5. Download source and documentation as a tarball
• 2.6. Download the LAMMPS source with git

These are the files and sub-directories in the LAMMPS distribution:

README	Short description of the LAMMPS package
LICENSE	GNU General Public License (GPL)
SECURITY.md	Security Policy for the LAMMPS package
bench	benchmark problems
cmake	CMake build files
doc	documentation
examples	simple test problems
fortran	Fortran wrapper for LAMMPS
lib	additional provided or external libraries
potentials	interatomic potential files
python	Python wrappers for LAMMPS
src	source files
tools	pre- and post-processing tools
unittest	sources and inputs for testing LAMMPS

You will have all of these if you download source. You will only have some of them if you download executables, as explained on the pages listed above.