IMPORTANT UPD: as @yole commented, this is a bad decision, as it will break the situation. There is no proper way to downgrade a plugin without breaking installation. Instead, consider upgrading your project to the latest version of Kotlin.
You have a plugin bundled with IntelliJ IDEA. At your own risk, you can remove your folder manually from the IntelliJ IDEA installation ( plugins/kotlin
). After that, you can install any compatible version of the plugin from the mail distribution , but your IDEA installation will be violated (see the comment).
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