While downloading the game with the GOG downloader
Avira gave a warning (in german):
"Muster 'DR/Delphi.Gen [dropper]'
in Datei 'D:\GOG.com Downloads\zak_mckracken_and_the_alien_mindbenders\setup_zak_mckracken_and_the_alien_mindbenders_2.0.0.4.exe gefunden.
Durchgeführte Aktion: Datei in Quarantäne verschieben"

Is there a virus in that download or is that a false alarm?