We have no way to support any checkout for auto-recurring payments, such as a subscription or installment plan. Even our own subscription plans (to pay for the use of our service) just uses PayPal's own, standard Recurring Payments solution as-is, but we can't integrate those types of payment into our cart and fulfillment system.
If you may be interested in PayPal Recurring Payments, you should consult PayPal help pages or support staff for further information, since we would not be involved in that service at all. The closest we can offer would be having a product that buyers would need to deliberately purchase manually on a regular basis, but this would not be automated, so you would need to devise your own method to keep track of who has/hasn't paid.