Khalid,
If you are downloading MaxDB for your personal use then download these. But if you are looking for MaxDB enterprise usage then you need to download MaxDB from the SMP. Just read this:
Note: These installation packages can be used free of charge according to the SAP Community License Agreement for SAP MaxDB. These packages are not for use with SAP applications. For that purpose, refer to the Download Area in SAP Service Marketplace (login required)
Regards
RB