Hi Joao Sousa, I can unerstand that it is a little bit difficult to find a specific product in the huge amount of all SAP products.
If you are an SAP customer, you should use SWDC to download the software (see for example note 1672252 for more information about how to find SAP MaxDB software).
I you want to use SAP MaxDB standalone please use the new SAP Store (see information from Christiane on our SCN site about this topic: SAP maxDb Software Donwload now via SAP Store).
Please write in more detail your proceduer and I can than assist to find the information.
Best regards Birgit Malik