Dear ZeroExperience,
Both NX NASTRAN V8.5 manuals & Release Guide V8.5 are part of the FEMAP V11 installation process, if you install the last version of FEMAP V11 then you can access to NX NASTRAN V8.5 manuals inside FEMAP from HELP > NX NASTRAN.
Best regards,
Blas.
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Blas Molero Hidalgo
Ingeniero Industrial
Director