Comodo installer sizes

Quick question:
the installers from web link Firewall Download | Best Firewall Security software for Windows
all have a file size of 50MB (x64 versions) regardless of weather is AV+firewall, AV only or Firewall only.

I can understand the cis premium been 50 MB as its a combination of AV+ firewall

What does not make scense to me is the fact the AV ONLY installer is also 50MB but has 1/2 the number of programs of cis premium. Same notion with Firewall only installer

In short how come not the following:?
AV+ firewall installer = 50MB
AV only installer = 25MB
Firewall only installer = 25MB