Umberto - I think the OP was trying to say that there is no link on the product page to request the email with the discount code.
Nowhere we had any link on the Product page to do that. The emails has been sent to all registered user of KORD V2, to the email they used to purchase it originally, when KORD V2 for MSFS came out, in September 2020.
If you lost that email, or you change email in the meantime, you need to contact support by email, so a NEW email will be re-sent, either on a new email address (in case you changed it) or to the same address it was already sent in 2020.
THIS email will contain a link that, as I've said, I already checked to be working perfectly fine, and will activate the discount automatically, without having to type anything. But you MUST buy from the LINK IN THE EMAIL.