hello, I bought today the license. by mistake a wrote my mail address wrong.
now i don’t have the license number…
I can not ask for help because (open card) i don’t have the order number…
and my computer is without protection…

please advice…

As has been explained many time in several threads, you need to contact avast (or the payment company) as they are the only ones who can change it.

thanks, how i can contact Avast?
where I can find support mail address?

https://support.avast.com

https://www.avast.com/faq.php?article=AVKB24#idt_0310
https://www.avast.com/faq.php?article=AVKB24#artTitle

Change your my.avast.com email address: https://www.avast.com/faq.php?article=AVKB210#idt_090

hello all and thanks for the help.
the main problem is that the e-mail address is not exist… :-\

That doesn’t matter.
As I said before you need to contact avast (or the payment company).