We have find a way to use normal PayPal and PayPal adaptive payement both together. You have to active both PayPal and PayPal adaptive payment with both credential. Please follow those instruction-
1. I will provide some code. You have to put the code in your child theme function.php file. After putting the code the main trick will happen.
2. After putting the code when a seller will purchase subscription pack that time the payment will process with the normal paypal. But when user will purchase normal product then the payment will process with the PayPal adaptive payment.