I have the same problem, with these differences.
I have an NBX3000 V 6.0.5
Downloaded NBXDCA_R6_0_6.exe
Installed that but failed on TAPI
Downloaded NBXTSP_R6_0_13.exe
Installed and installation finished including downloading directory from NBX
It suggests to: in Contraol Panel under Telephone to add the NBX TAPI, but it is not showing as an option.
Even tried started Telephony service in services but that did not help either.
Thanks,
Rolf
#TAPI#DCA#NBX