Quote - Hi. I am seeking a possibility to provide a specific download only to buyers of a specific product. Apart from chaning the existing product and uploading it again, i was more thinking of a freebie, restricted to a group of people, who bought a product.

Does this functionality already exist and i missed it?

Thanks.

Possibly, my understanding is that merchants get a small Renderosity "FileLocker" allocation, which you can use for things like this if you don't have any other web space you can use.
If you really want to make sure that only people with a particular item can use the freebie item, you can always encode it against the product zip (or a file from the product) using RTEncoder (small licence fee required for encoding functionality, decoding is free).
Password protecting the archive the freebie is in is a fallback if you don't want to encode.