Steam
If you are a Steam user, get the game from:
Chicken Invaders Universe on Steam
Stand-alone
If you prefer to have the stand-alone Windows version, the latest update can be downloaded here:
https://universe.chickeninvaders.com/files/ChickenInvadersUniverseInstaller.exe
- If you still receive the old version, try this link instead:
https://universe.chickeninvaders.com/files/ChickenInvadersUniverseInstaller138_7_3.exe
- If HTTPS downloads are too slow for you, try this link instead (you may need to manually copy-paste it in your browser’s address bar):
http://universe.chickeninvaders.com/files/ChickenInvadersUniverseInstaller.exe
iOS
Download it from Apple’s App Store:
Android
Download it from Google Play:
If Google Play says that “this game doesn’t work on your device”, it’s because your Android device is 32-bit, but Google Play requires 64-bit. In that case, download the 32-bit build below. 
Only download this if the Google Play version doesn’t work for you:
https://universe.chickeninvaders.com/files/CIU.ia.armv7.1380703.apk
You’ll most likely be presented with several warnings about installing apps outside Google Play and/or unverified developers. You will need to accept them before you can continue. You might also have to separately enable installing 3rd-party apps on your phone (if there is such an option).