Thanks so much, DjNDB! I tried the manual method and it worked like a charm. But only after several tries, though, due to my own carelessness. I can't stress enough when I say ALWAYS BACK UP YOUR GAMES. I had to reinstall the files for episode 4 and delete temp (before starting and clicking GET in-game) for it to finally work. Bothering with the pref.prop made my game go all kaflooey and didn't help; so I left it alone in my final try.
TellTale needs to provide a patch or a fix for this soon; we shouldn't have to work our way around it to play a game we bought. Not cool!