So it looks like the support model is to not support, wait for users to figure it out on their own if they have a free hour or two and are really pissed.
So you have to go to the avast website and create an account.
You cannot just log in online and email the link to the other PC, you have to log in to avast using the avast app, not the website. Then it makes you reboot, then you have to log into the avast app again, then reinstall from the app, then run.
Advise: create the account but do not distribute the link from there. load free avast on the other machine (I had that already) then log in to synch accounts, d/l from there. If you had an expired trial of cleanup (or whatever0 make sure you deselect that, it will be default selected). Then run.
Of course you also have to have 20:10 vision with no astigmatism to pass the verification test. The audio doesn't seem to work, I guess that would be another ignored email. I swear, let me have 5 minutes in a locked room with someone making these tech decisions, just 5 minutes.