NX Client 3.5.0 is a compressed standard package (PKG) shipping nxclient programs (NX Client GUI, NX Connection Wizard and NX Session Administrator) natively compiled on PPC. They should function reasonably well even under the Rosetta translator on a Intel-based Macintosh hardware.
The other NX components included in the NX Client package for Mac OS X are compiled as Universal Binaries, that's to say binaries that run natively on both PPC and Intel architecture. These components are:
Starting from version 10.7, PowerPC applications are no more supported on Mac. This means that NX Client version 3.5.0 can't be run there. NoMachine Enteprise Client 4 or later is required.