Hello Gopinath,
do you mean the several "EHP7 FOR SAP ERP 6.0 on HANA Installation Export" files?
Because all of these files are required: the "EHP7 FOR SAP ERP 6.0 on HANA Installation Export" object has been split up into 18 files, so you need to download all of those 18 files for a complete installation.
Also: in the case of other files, you need to check which version you need: e.g. which "Presentation - MaxDB Release" version is required for the installation, etc.
Best regards,
Laszlo