Quick Question Re: Comodo Firewall Updates

When Comodo Firewall automatically or manually checks for and downloads updates, are the updates incremental, or is the latest version downloaded in its entirety? I assume the complete current version is downloaded and installed. Again, just curious.

For the past year, whenever a new version of the Firewall is available, I have manually downloaded it directly from the Comodo download page (that is, not initiated via the installed Firewall), uninstalled the old version completely, and installed the latest version. However, with COMODO Firewall update now supporting the migration of a previous version’s configuration settings (Firewall and Defense+) to the latest version, I’m inclined to perform a manual check for update via the Firewall.