Updated Avast Free to 22.4.6011 (build 22.4.7175.722). Rebooted. Tried to get Rescuedisk.iso downloaded but stuck at start. Cancelled it, but that also stuck.
Only way out was Restart.
Tried again after reboot. After over an hour, still no download progress.
I give up.
EDIT: I left it without cancelling. After nearly 2hours, it finally completed the download. It should not take that long.