more than one Serials with one product download

Hi Guys,

What i want:
- One product(tool1) with one download (let' say setup.msi)
- we have different prices for different quatities:
for example: 1 license for 100 €
10 licenses for 90 €
more than 25 licenses for 75 €

What i have:
- with HikaSerial i have an SerialPack link to the product.
- the product has the 3 different prices
- i've add the setup file to the product

if I buy the product, I can see the file the same number of times, as I have bought the product.
I would like to see just once per order.

I have also tried with related products:
One Product for the download and one for the serials.

the works so far - but you can buy the downloadable as a separate product without price, that's not what I want.

Can you please explain the best way to realize this.

Thanks