You can say "you can refuse the installation" this is too dangerous on a production server, it's a question of trust.
So filezilla will disappear in my toolbox... too bad, it was a good software
ESET clean it : FileZilla deleted
C:\Users\Administrateur\Downloads\FileZilla_3.40.0_win64-setup_bundled.exe = NSIS = Fusion.dll - une variante de Win32/FusionCore.AL application potentiellement indésirable - nettoyé par suppression [1]