Before we get started with the steps, first try and reinstall Minecraft to ensure there are no corrupt files causing issues. Make sure you save your worlds properly so you don't lose any progress.

When trying to launch a game or download content, Minecraft users are getting Minecraft failed to download file, The file contents differ from what was expected error ...

An old version of Java may be why the JNI error has occurred in Minecraft. To fix this issue, you’ll need to install the latest JDK (Java Development Kit). However ...