Payment Plan is a PRO feature.
At first, we have to create payment plans. You may know the process of creating payment plans here.
To set up payment plans deposit for all products, go to Partial Payment-> Setting-> Default Setting.
Step-1: Enable Partial By Default: Select Yes.
Step-2: Default Partial Type: Select Payment Plan.
Step-3: Default Payment Plans: Select the payment plan(s).
The Default Settings:
You can buy the PRO plugin from this URL: Advanced – Deposit & Partial Payments for WooCommerce PRO