Avast has really messed me up here by not allowing alternative methods of migrating subscriptions. I actually chatted with a support person and I was supposed to have my subscriptions migrated to a new email because I lost my old email due to the pandemic and not being able to afford my original email service.
All avenues are linked to that email (digital river sent email to old/non-existant email, so cannot get into email with order number) My subscriptions do not show up as migrated and have been double billed (I paid for a year subscription manually and then got autobilled for 2 years today) and have no recourse.
I find it very, very disturbing that there is no other way to take care of things than to access a defunct email address.