The official MK mobile game is free but heavily monetized (souls, coins, packs). A "zip file download" implies a cracked, unlimited-currency version.
Even if you manage to extract the archive without a password, you will usually find a collection of useless, broken files or a completely different, heavily modded mobile game disguised with Mortal Kombat 11 mobile wallpapers. Legitimate Ways to Play Mortal Kombat on Android mortal kombat 11 zip file download for android
Stream the game directly from your PS4 or PS5 to your Android device using the official PS Remote Play app. The official MK mobile game is free but