As the topic title says.

I just downloaded it and it works fine. Which OS are you using?

It's not working with me either, I'm using windowns XP
Edit: Never mind, I figured it out
They tell us to hold Alt+Shift, but that doesn't work...
Instead, use the 0 button, that will do it :D

i've been trying that too, and it still doesn't seem to be working. do you have to get them in the *exact* center of the birds? or does abe have to be in the exact center? oh well... guess i'll go for the bad ending lol

no, you have to have the birds onscreen, they fly off if you get too close. Try it from further away

And remember to hold a button for a while, not just push it once. I noticed that some "GameSpeak" commands need it too, for example "1" ("Hi!").
EDIT:
Correction - all of commands need holding a button for a little while, but "Chant" usually needs a few seconds of holding to take effect.

hey there...new here. I just wanted you guys to know I had the same problem (with xp) and it was the zero button for me too. No matter where I stood, alt/shift would not work. Zero did.