Many high-performance computing (HPC) clusters, such as the University of Utah CHPC , provide Gaussian 09 to authorized users. You may need to request access to a specific "gaussian" user group.

Scientific software requires precise environment configuration. Compromised versions may produce incorrect data, which can ruin research projects.

Unofficial downloads frequently contain malware or viruses.

Since Gaussian is proprietary, the only official way to obtain the software is by purchasing a license or using one provided by an institution.

Websites offering "cracked" or torrented versions of Gaussian 09 are often unreliable and pose significant risks: