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Under , click New and add the following variables: Variable Name: GAUSS_EXEDIR | Variable Value: C:\G16W

, the graphical interface used to build molecules and view results. This is typically a separate installer. Gaussian.com Do you have a specific error message license type (academic vs. commercial) you are working with? Running Gaussian

Once you have the official installer, the process is straightforward.

Click in the System Properties window.

: The 64-bit version has no artificial RAM limits, whereas the 32-bit version is capped at 2 GB. How to Obtain and Install Gaussian 16

Gaussian is a and is not available for free public download. Gaussian 16

"It's a trap, Elias! It's a buggy build! It’s the 'Blue Screen of Death' dressed up as a quantum chemistry package!" download+gaussian+16+windows+new

Locate the downloaded file (typically named something like G16W-xxx.zip ).

If you need help checking your university's access or troubleshooting an error, please let me know: Are you using Gaussian for or commercial research? Do you need help with a specific calculation error code ?

Right-click the downloaded .zip folder and select . Under , click New and add the following

A: Yes, Gaussian 16 is available for macOS (Intel-based; Apple Silicon runs via Rosetta 2), as well as Linux and UNIX systems. The download and licensing process is similar to Windows.

Open Gaussian 16W, navigate to the file preferences, and set this folder as your default . Ensure this folder has full read/write permissions. 5. Getting Started: Running Your First Calculation

Right-click setup.exe → Run as Administrator . commercial) you are working with

Gaussian 16 is commercial software and . You cannot legally download the software without a valid license key or official account credentials provided by Gaussian, Inc.

Open GaussView, draw a simple molecule (such as water or methane), and open the menu. Choose your desired job type (e.g., Geometry Optimization), select a method (like DFT/B3LYP), choose a basis set (like 6-31G), and click submit. A Warning Against Unauthorized Downloads