OK, so I played through a bit farther. First off, yes I'm getting errors when trying to chat with various people at work. One is related to an EarlyAfternoon variable, but there were a couple of not closed tags and such.
The good news is that you can use the left arrow key (upper left corner) to back out of the 'broken dialogue', so you can kind of find your way around the errors by trying other choices. Unfortunately, this kind of breaks certain story forks.
As for missing files, the only thing that would likely be missing is image files. I saw that with just the 0.4.8 patch, and you'll just get the broken image symbol and a blank box. The .html file contains all of the code, so the coding errors are there. I'm not acquainted with many of the coding conventions used there, so I have no idea how one might fix the errors.
The only mention on the Dev Patreon page today is something about on to chapter 2, locked behind the paywall. Is anyone here a patron?