CIS without the antivirus is the same as Comodo Firewall.
The download link for Comodo Firewall will direct you to the same file as for CIS.
I would advise uninstalling your version of Comodo Firewall and then installing the new one. During this time you should enable Windows Firewall. I’d also advise switching the configuration for the new one to proactive security as the default is a bit weak. Disable Windows Firewall after Comodo Firewall is installed.
Re. “uninstalling then install” - when I ‘Check for updates’, yes updates are available, clicking Next starts an ‘Installing updates’ process.
Should I continue with this update process, or uninstall-install as you advise?
Re. “enable "Windows Firewall” - Can I uninstall-install off-line ie. without being connected to the internet or do I need to have an active internet connection for the install process?
As for Sandbox, I’ll need more time to digest this.
I do not believe that there is a way to upgrade to the newest version through the internal update. This requires the uninstall-install.
I don’t think you need an internet connection to install. If you find you do then you can just enable Windows Firewall and then continue.
Understood, I don’t even understand this completely myself. I keep enabling it and then changing my mind and disabling it. It really depends on how you want to use this product.