Answer:
In RF‑DYNAM Pro ‑ Natural Vibrations, it is possible to import the geometrical stiffness matrix. You can use it to consider the second‑order analysis. The equivalent lateral loads for earthquakes generated with the RF‑DYNAM Pro - Equivalent Loads add-on module consider this stiffness modification.
The attached file describes when the second-order analysis according to ASCE 7‑16 has to be considered, and which options are offered by the RF‑DYNAM Pro add-on modules.