My email was specific:
"Purchase the Infotainment Upgrade today for $2,500 plus applicable tax to add in-car video streaming, Caraoke, additional Tesla Arcade games and future functionality to your Model S touchscreen*.
Schedule an appointment for purchase and installation using the Tesla app. Select 'Accessories' then ‘Upgrades & Installations’ from the Schedule Service menu and enter ‘Infotainment Upgrade’ in the description.
As an owner with Full Self-Driving configured, you'll also receive the complimentary new Full Self-Driving Computer during your installation.
If you don’t purchase the Infotainment Upgrade, we will contact you when the Full Self-Driving Computer is available for your configuration."