Gaussian Inc. frequently releases minor updates (e.g., transitioning from Revision A.03 to C.01). These updates often contain bug fixes and performance patches.
To see if you need an update, open your current Gaussian 16W application. The revision version (e.g., Rev C.01) is usually listed at the top of the output file or in the "About" section of the GaussView interface. Comparing this to the latest release notes on the Gaussian homepage will tell you if a new "upd" is necessary. Conclusion gaussian 16w download upd
Official updates provide technical support that is essential when a complex calculation fails to converge. How to Check Your Current Version Gaussian Inc
Minimum 2GB, though 8GB+ is recommended for complex calculations. gaussian 16w download upd