Hi Vivek,
Yes you need to download Netweaver 7.4, Check below blog
How to install SAP NW 7.4 PO on localhost
Go to http://service.sap.com/swdc
log in with you SAP ID and navigate to Installation and Upgrades->A-Z Index->N->SAP Netweaver->SAP Netweaver 7.4
Regards,
Praveen.