NEC-LIST: 4NEC2 for larger segments

Hi,
I've got 1799 segments to run but 4NEC2 bombs out. I've downloaded
larger segment compiled runtimes, but have no idea how to configure
4NEC2 to use them. Any helpers?

I'm using the latest version also. Would like to now what the uses are
for the following and how to configure the GUI to use them. Thanks!
I've got:
Nec2d.exe,
Nec2d_la.exe
Nec2d1k4.exe
Nex2d512.exe
Nec2dXS1k5.exe
Nec2dxs500.exe
Somnec2d.exe

Non vertual memory: (or virual)
Necdxs11k.exe
Nec2dxs1k5.exe
Nec2dxs3k0.exe
Nec2dxs500.exe
Nec2dxs5k0.exe
Nex2dxs8k0.exe

Thanks!,
Ken Carrigan

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