Type in your Chapman University email address and select the option to sign in using your Chapman University username and password (Note: The first time that you sign in using your school login, you will be prompted to link it to your Wolfram ID).
If you would like to stay at your current version of Mathematica:.
To upgrade to version 12.3.1 or newer version, follow the directions under “Licensing Access (Single Machine)”.
Reactivating Mathematica Versions 12.3.0 and earlier
(Note: The first time that you sign in using your school login, you will be prompted to link it to your Wolfram ID).
When prompted to activate through your organization, sign in with your Chapman University login (for details, see instructions, click here):.
Click the link to download Mathematica for your Operating System.
Type in your Chapman University email address and click Continue.