Aurora R7, Bios Updater App crashing (Exception 0xc0000005), solved

Hi. I Wanted to update my BIOS to 1.0.18, but every time i start the updater, the app crashes.

Windows event viewer shows: (german language)

Name der fehlerhaften Anwendung: Alienware_Aurora_R7_1.0.18.exe, Version: 1.0.5.0, Zeitstempel: 0x5a0e913f
Name des fehlerhaften Moduls: Alienware_Aurora_R7_1.0.18.exe, Version: 1.0.5.0, Zeitstempel: 0x5a0e913f
Ausnahmecode: 0xc0000005 (Exception code)
Fehleroffset: 0x00000000000930b0 (Error offset)
ID des fehlerhaften Prozesses: 0x49d4 (Id of faulty process)
Startzeit der fehlerhaften Anwendung: 0x01d4eb16cfbc8147 (timestamp of app crash)
Pfad der fehlerhaften Anwendung: C:\Users\xxxx\Downloads\Alienware_Aurora_R7_1.0.18.exe
Pfad des fehlerhaften Moduls: C:\Users\xxxx\Downloads\Alienware_Aurora_R7_1.0.18.exe
Berichtskennung: 9b07f062-ca29-45ba-92b6-d1c286ef4c2a

What I tried so far:

- tried to close all apps in background, tray

- restart windows in safe mode and try again

- restart windows with disabled driver signature enforcement

- run bios updater in compatibility mode

- scanned for malware and viruses with malwarebytes antimalware and windows anti virus (nothing found)

- disabled anti virus/windows defender firewall

- repaired (cleaned) windows registry

- sfc /scannow through command line

- enabled/disabled Windows DEP

- scanned hardware, performance with Dell Support Assist with no warnings/errors

- tried to install through SupportAssist

- keep all other drivers up to date

Nothing seems to help. Is there another way to update bios, like through usb stick?
Tried to open bios updater app for previous version (1.0.17), also crashes.

Any help appreciated.