No way to reply to comments here? Strange. Anyway, I think there was no PC demo because they didn't want to add extra work. On consoles, you can add all files and libraries needed to run the engine and the content in the "demo" areas. If you played the console demo, you likely noticed there were areas that seemed to be complete although you couldn't access them. If they released that on PC, we'd find away to get through and into areas that abruptly end. So, it was likely just "easy" to load 10% of the software on consoles and program a few doors not to open, and "hard / time consuming" to clip out everything beyond the door (incomplete maps) and seal it up for a PC version. No evidence, just opinion here.