Please add a feature so existing customers can buy paid upgrades at discount prices while new customers will pay full price.
I have a product and I am releasing minor upgrades and bug fixes. and customers download it free of charge. But I am also working on a new system for the same product will is going to be a major update and I want to charge for the upgrade. so people who already had version 1 can upgrade to version 2 at a discount price compared to new customers who will pay the full price for the new major product version.