I understand you're looking for information on Gaussian 16, but I need to be clear upfront: that requires a paid license. There is no legal "free download" available from the developer, Gaussian, Inc.
Gaussian 16 software has a wide range of features and applications, including: gaussian 16 software download free
Running Gaussian 16 on CCAST Clusters - NDSU IT Knowledge Base I understand you're looking for information on Gaussian