Stata 18 Maintenance plans
If you would like to always keep your Stata software up-to-date, you can include a maintenance plan with your order. For a fixed annual or bi-annual fee, the maintenance plan guarantees that you will always have access to the latest version of Stata. You get free upgrades to major releases whenever they are made generally available (from the purchase date to the expiration date of the contract). Maintenance charges are annual, and maintenance may be purchased only when you buy a new license or upgrade an existing one.