It seems it's because they released an unofficial updated version like they're used to do every time.
If any of you guys have access to this up-to-date version, kindly drop me a private message with a link to download it, as google play still shows this version.
The "invalid application" error is generated from my custom way of hacking this game, in order to let you play this mod version. Rather than saying outdated, it says invalid application and it doesn't let you play.