Ich möchte keine Abo-Verlängerung
First, I’m an Avast user and not an Avast Team member.
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Cancelling automatic renewal of the Avast subscription - See https://support.avast.com/article/account-unsubscribe/#pc or https://support.avast.com/article/35 ,use the primary link for advice. Also see https://support.avast.com/article/Unsubscribe-FAQ/#pc
Switch back to Avast Free Antivirus - https://support.avast.com/article/12/#idt_020