Where do I find MaxDB for

Im trying to install a SAP Netweaver 04 Support Release 1 Developer Workplace default installation (\Java System\MaxDB\Developer Workplace\SAP Netweaver Developer Workplace Installation) but I cannot find the correct zip containing MaxDB.

I downloaded and expanded the following archives but SAPInst.exe rejected all three because the labels didnt match the one it was expecting, 'MAXDB:750xx:DEV-ED-RDBMS:MAX DB:*'

-51030720_1 SAP Kernel 6.40 MaxDB

-51030725 "DVD RDBMS MAXDB 7.50 Build 18"

-51030767_1 SAP Kernel (U) 6.40 MaxDB NTI386

Can anyone tell me which is the correct archive I should be using?

Cheers,

Steve