If you're evaluating whether to purchase, Stata 14 includes:
Many educational institutions provide Stata at no cost to their students and staff. Marquette University Installation guide: Download (Windows) - Stata download stata 14 for windows free
Stata 18 has Bayesian machine learning, new panel-data estimators, and a modern interface. Stata 14 lacks these but remains excellent for 95% of basic and intermediate stats. If you're evaluating whether to purchase, Stata 14
– Students can purchase Stata at significantly reduced rates (often $45-200) If you're evaluating whether to purchase
Some researchers who published books or articles using Stata 14 received complimentary copies. Very occasionally, they give away old licenses legally. Check academic Twitter or LinkedIn groups.