I had a similar problem. The search for games.js run by thcrap_configure didn't find th14.exe
First of all, thanks for this thread! I wouldn't have figured it out if DTM didn't suggest changing the games.js file
What I did to fix it was...
1. Delete any attempt I made at making the shortcut th14 (en)
If you've been trying to get it to work previously, then make sure you do this or else it might not overwrite the shortcut
2. Run thcrap_configure like normal, and make sure it has created a games.js file
3. Follow DTM's (right above this post) instruction to manually change the games.js file in notepad.
It's worth noting that when I copied the directory, the slashes were in the wrong direction (compared to the directories already in the text file). I don't know if that actually changes anything. You should probably fix it.
4. Run thcrap_configure like normal, and at the "Locating games" section type n, enter, n, enter, enter (you keep it from scanning because step 3 manually "scanned" it for DDC)
I got to this part while testing and forgot (for step 3) to put a quotation mark (") before the C: for the directory I had entered. I got this error, so I assume if you type anything bogus you will get a similar error.
JSON parsing error:
ivalid token near 'C'
(games.js, line 27, column 11)
When I got it right, I didn't get an error. That's obvious though I guess.
5. Open the new shortcut for th14 (en) and say OK.
Hope this helps anyone who has the same issue; just let me know if it doesn't work, if it does work, if I need to clarify, or whatever.