I wrote this Thread a complete hour, but this stupid CloudFlare sayd "Sry we blocked you" so I uploaded the text somewhere else:
https://pastebin.com/KZzWjE1j
Hello Marius,
Please contact us at bitsy@bitdefender.com with a BDSYS log and a sample for update.exe in order to further investigate:
https://www.bitdefender.com/consumer/support/answer/1922/
Thank you!