The following download links are password protected. Gaussian is available for no charge to Penn Chemistry researchers (click here for password request if you are a Penn Chemistry researcher). The installation instructions are in a readme file and it is recommended that you have experience with Linux/UNIX to be able to install it. If you do not have such experience, you may access a pre-installed version of Gaussian 09 using a GPC WebMO account. All other Penn researchers (PennMed, SEAS, Nursing, Wharton, etc) can obtain Gaussian for a small charge by contacting firstname.lastname@example.org.
For a guide to using Gaussian on coffee.chem, click here.