How to install the "Main Checkout Flow" - migrating from B2B Legacy Checkout Flow

Hello,

Anyone know how we can install the newer Main Checkout Flow? We implemented the B2B Legacy Checkout flow a couple of years ago.

1. SF Ben - Choose a Checkout Flow/Experience
   1. Main Checkout - This flow is now one of two of the recommended approaches (along with “Re-entrant Checkout”). It has an updated structure and doesn’t utilize the cart session structure anymore. 
2. Salesforce Guide - B2B Checkout Flows

Thanks in advance!