How to prevent NPCs from dying in anomalies? As in Call of Pripyat. (STALKER: Shadow of Chernobyl)

Play with the installed AMK, or an alternative mod.

just write zeros to all the immunities in the file config creatures m_stalker.ltx

something like [stalker_immunities]
burn_immunity = 0.0
strike_immunity = 0.0
shock_immunity = 0.0
wound_immunity = 1.0
radiation_immunity = 0.0
telepatic_immunity = 0.0
chemical_burn_immunity = 0.0
explosion_immunity = 1.0
fire_wound_immunity = 1.0
wound_2_immunity = 1.0

Pffff in ZP they may not die, but this is not interesting especially with the zone overlord.

When can anomalies be spawned?

vtlk760 is
stupid, nialistically invented.

vtlk760 ATP
.