To find the history of NPS upgrade on your server, run below command:
$more /nz/.versions/versionhistory
2017-08-22 15:17:28 -0400 (EDT)| ACTION=upgrade ORIGIN=6.0.5-0.F-1.P-10.Bld-24823 TARGET=7.0.2-0.F-1.P-5.Bld-31068 STATE=Successful
2018-02-15 22:35:36 -0500 (EST)| ACTION=upgrade ORIGIN=7.0.2-0.F-1.P-5.Bld-31068 TARGET=7.0.2-0.F-1.P-8.Bld-32960 STATE=Successful
2018-07-22 03:42:59 -0400 (EDT)| ACTION=upgrade ORIGIN=7.0.2-0.F-1.P-8.Bld-32960 TARGET=7.0.2.11-P2-F1-Bld35921 STATE=Successful
The latest version of Netezza is V7.2.1 as per IBM website – https://www.ibm.com/support/knowledgecenter/en/SSULQD_7.2.1/com.ibm.nz.reln.doc/c_relnotes_overview.html
IBM Netezza Support