From the NWDS update site
https://nwds.sap.com/swdc/downloads/updates/netweaver/nwds/nw/730/doc/update.html
This procedure describes the available options for update of a Developer Studio with version 7.1 SP3 and higher.
Before you update your Developer Studio, note that the version of the Developer Studio must be the same as the version of your AS Java.