I'm lost! How to get the VESC Tool

Hi,

I hold the Vesc & in my hands and get crazy.

Don't know how to download the VESC tool.
According to the VESC-Tool page I need code.
"This product is available if you have purchased original VESC hardware and entered the code you got to enable access. After completing this (free) purchase, you will obtain"
Where does the code come from and where I've to enter it?? Is it the invoice number?

Max