I am just reporting what happened to me, bought and DLd via GOG galaxy, made skirmish with enemy Alien faction and the game used LC units instead of aliens.

When I requested a code and used the "Change Serial Number" app installed with the game to add it to the game, the aliens were completely different when I remade the same skirmish, units were zerg-like & biohazard looking.

GOG DRM bypass did not work correctly. (Win10 x64)