I'm glad you finally found exactly what you were looking for. My apologies for not coming here earlier: my internet has been broken for a month after a storm, and it happened only 2 days after the release of Catyph. I'm back online now, since 1 week, and I have had a lot of things to do (late things I mean)!
It would seem that I am more available now, so if you need help, please let me know!
Here's a summary of the versions:
- usual version of the game available on Steam and Humble (DRM free) - PS: the Humble purchase delivers a Steam key.
- self-published DVD (DRM Free, no internet/Steam required)
- other DRM free digital version: itch.io (DRM free, downloadable, a little less expensive)
All the links can be found here through the buttons at the bottom of the page:http://www.theicehouse.fr/games-digital---catyph-the-kunci-experiment.html
Regarding the first update:
- it should be downloaded automatically for Steam users (however please check the note in the discussions /community hub)
- it is available for other users (including the DVD) on the Catyph site, or itch.io
This update is not absolutely necessary but recommended.
The full walkthrough is also available on the Steam community hub in the discussions, here:http://steamcommunity.com/app/396870/discussions/
I hope you like the game. It's certainly not perfect but I did my best. Good luck during this challenging journey!