Thread:AngryBirdsBiggestFan2345/@comment-28730621-20191021223020/@comment-28730621-20191101134420

Hey there, I realized  that Angry Birds Halloween (the first ever version of AB Seasons) was never released on Android, the actual oldest version in Android was 1.1.0 (it only contains Season's Greedings and Trick or Treat, though the Christmas episodes are unplayable because of the fact that when you click on a level, an error message will appear), so pretty much the only way to play Angry Birds Halloween is to have an older iPhone (newer ones won't work), jailbreak it and find an app (forgot it's name) that let's you download that old version.

Hope that helps