Just received the answer from NL.
There's any plan to develop plugins of the old version (1.7.1) for Archicad 13. Only version 2 is supported for Archicad 13.
So it seems that only to use the old maxwell in archicad is via Archicad 12.
Maxwell 2.7.20
Archicad 16 ITA latest hotfix
Dual Xeon Quadcore
Nvdia Quadro FX1700
8Gb Ram
Win Vista BUS 64bit