Installation in steam version does not work

Hi…,

Welcome.

EPERM error results from permissions, likely because you have installed into Program Files directory.

Please install “only for you” so to default %localappdata%/Programs/Navigraph Navdata Center.

Please see Can't Install AIRAC Cycle or Navigraph Charts in Game - EPERM operation not permitted - #5 by rscarter

Cheers
Ian