Annual licenses and student versions have hard expiration dates.

When you launch Stata for the first time, an dialog box will appear. Installation guide: Setting up the license (Mac) - Stata

To activate Stata, you need a valid License and Activation Key

Discounted licensing specifically for faculty and staff at academic institutions. How to Get a Valid Stata Activation Key

: Upon opening the software for the first time, Stata prompts for these three items. If you are updating an existing version, the Stata "About" menu allows you to "Update license" and enter new credentials manually.