[split] Passthrough Changes with v17

I have downloaded the 17.3 krypton in 86.apk, armeable-v7a.apk and arm64-v8a-1.apk all around 85MB and when I want to install any of them the message ” there has been a problem parsing this package” I am a novice at this and can do most things but this is really doing my head in. Any help out there