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The phone help isn’t directly Avast, it’s a third party support group.

Help is given here ( Avast support forum ) for free, to transfer the license you simply open the Avast email that was originally sent containing the license file on the new system and double click on the file.

If you don’t have that original email still you’ll need to get a resend http://www.avast.com/resend-license-paid.php using the original email address that was first used for the purchase.