Mail Adresse ändern
First, I’m an Avast user and not an Avast Team member.
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Can I change the e-mail address I use to log in to my Avast Account - see
The link I posted should detect your language and present the information in your language.
See the “How can I add another email address to my Avast Account?” section in the above link.
What Avast Program are you using ?
As that might also impact any payment mandate if it is an Avast paid program.