I am not sure which Comodo version you have, but the latest version of Comodo Internet Security is 12.3.4.8162.
The installer for this latest version can be found in this post.
For the free version, download CIS Premium 2025 (for the difference between Premium & Pro Versions, see below).
The installer above will allow you select the components that you wish to install (such as the firewall).
Many of Comodo’s webpages are out of date and provide old versions (and it looks like the firewall webpage you showed does indeed provide an outdated version).
Premium versus Pro Versions of CIS
Comodo Internet Security (CIS) and Comodo firewall are free.
However, there is also a paid “package” that includes CIS, but also adds supplementary services such as unlimited product support, online storage, and a $500 virus free guarantee.
The free version of CIS and the version of CIS included in the paid package both have the same features, functionality, and protection (in other words, all features in CIS are accessible and fully functional in the free version).
The outdated website does not make this distinction very clear.
The free version is called Comodo Internet security Premium.
The paid package is called Comodo Internet security Pro (previously called CIS complete).