You can give a customer one of your paid packages for free by creating a voucher on your Publisher Account and giving them the voucher code so they can redeem it. You can create up to 12 vouchers per year for each Asset.
Note: You can only give vouchers away for free. You cannot sell them or exchange them.
To issue a voucher:
Open the Asset Store Publisher portal and navigate to the Vouchers tab.
Select the package you want to create a voucher for.
Click the Create Voucher button and follow the instructions.