You access either https://launchpad.support.sap.com/#/softwarecenter.... or https://support.sap.com/en/my-support/software-downloads.html and search NetWeaver Developer Studio or NWDS. You find results for both 7.3 and 7.31 but when you click on the link you see 'Items Available to Download (0)'.
SAP NetWeaver 7.3
SAP enhancement package 1 for SAP NetWeaver 7.3
SAP NetWeaver 7.4
Eclipse, launchpad, download , KBA , BC-DWB-JAV-J2E , NWDS JavaEE Tool Set , BC-DWB-JAV-COR , Core Frameworks , Problem
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