For information only.

I purchased Infa as Episode 1 and 2, and then received the Episode 3 update after I had started playing Episode 1. When I got to the end of C8_M6 the next chapter failed with the windows message "Infa.exe has stopped working".

After poking around a bit I realise that I had chosen to run Infa at a resolution of 2560x1440 but the Episode 3 upgrade had reset some of the user settings (console hints were reset to 'on' for instance) and the video resolution 'expected' was 1980 x1080. I reset my settings to 2560x1440 and the next Chapter loaded without error. On reflection I recall that there were also odd instances where level changes in Episode 2 also would fail (but restart without issue) since the Episode 3 upgrade.

Hope that helps.