Multi-core Intel Xeon, Core i7/i9, or AMD Ryzen/EPYC. More cores allow faster parallel calculations using shared memory (Link 0 commands).
Set the job type to and choose a basic method like B3LYP with a 6-31G(d) basis set. download gaussian 16 windows
Under , ensure GAUSS_EXEDIR points to C:\G16W . Multi-core Intel Xeon, Core i7/i9, or AMD Ryzen/EPYC