Is there a

1.1.50

version of the Kotlin plugin and how do I get it? Idea is complaining about binary incompatibilities, and the auto updater doesn't see the update because the current version is

1.2-M2-release-IJ2017.2-1

and that's considered a higher version.

The new version of the plugin downloaded for me - did you change back to the stable release stream?

If you had already installed the newer version 1.2-M2, you may need to uninstall it first and then update back from the stable channel. Or you can download the plugin here: https://plugins.jetbrains.com/plugin/6954-kotlin and install it from disk

I'll try reinstalling it, thanks both of you.