Happy to read that you've enjoyed the game so far! As for the CG's in your question:
Itch.io contains the public version (currently v0.3), which runs one update cycle behind the Patreon version (currently v0.4).
V0.4 was focused on expanding one of the new storylines that contains all those CG's you mentioned, so unfortunately they wouldn't be accessible in v0.3. Now the good news is that in only 2 weeks or so the next update should be coming out on Patreon, and then the public version becomes v0.4.
In v0.4 you can reach those CG's by:
Leaving with Kate > Refusing to join mercenaries > Run away from the bandit > Leave Lethram.
That puts you on the path that contains all those CG's you referenced.
Hope this clears it up for you, and I hope you'll stick around for all the future updates!