These are the OS/Hardware platforms that NFS is known to run on natively:

X86 X86-64 ARMv6 ARMv7 GPU
Windows (98 or later),
Linux,
Mac OS 10.4 or later
Windows,
Linux,
Mac OS 10.5 or later,
FreeBSD
-
-
-

Note that for the 16e Lattice Sieve V5 application there is only a Windows 64-bit application for the Windows platform.
The same applies for OSX: there is only a OSX for 64 bit MacIntel for the 16e Lattice Sieve V5 application, no 32-bit.
32 bit machines need Linux to crunch the 16e Lattice Sieve V5 application.