Dear Developers,
Maybe this could help to narrow down the problem : the issue seems to be related to an incomplete communication during the installation process between my computer and a Avast database.
When I turn off the wifi, the installation process quickly ends with the now familiar message "The installation failed. The installer encountered an error that caused the installation to fail. Contact software manufacturer for assistance."
When the wifi is on, it takes much longer to get the same message. I have used a free VPN, for every installation attempt (at least 5 in that case), I clearly see the monthly authorised download capacity down by 30Mo. Because I have tried to reinstall VPN Secureline with previous Time machine backups, when I hadn't yet bought this product, my suggestion is that my computer ID must be registered somewhere and installation is denied in order to prevent some kind of cheating.
Could this be the source of my problem ?
Many thanks,
Alex