Hello again
The history ends with this: A partner of SAP, with whom we have maintenance contract, sent us the installers and SAP Marketplace answeredthe requestin whichI asked permissiontodownload theinstaller... so, I am happy!
I recommend you to ask for help to this link https://websmp207.sap-ag.de/contactus they will answer you in less than 3 hours.
I wish you a happy new year!!! (Late)