Avast Mac Security v12.7 not updating behind a VPN connection: error 22 / 403

Hi, I use a Mac with the latest OS installed and v12.7 f the Avast for Mac. Recently (past week or so) I have noticed that the avast program will not update if my VPN is turned on. I always have the VPN turned on and this hasn’t been a problem in the past (I see the green “updated” pop-ups).

Trying to do an update however results in:

curl: (22) The requested URL returned error: 403 Forbidden
… <retries 3 x>
Warning: Download failed [exit code 22]

Ideas?

Thanks