Install KORG wavestate and/or opsix plugins from the Splice desktop app and restart your machine. You can find the plugins in the Apps & Plugins tab of the Splice desktop app:
To get wavestate and/or opsix plugins up and running in Ableton you need to check Ableton's AU/VST settings:
File and Folder
Make sure "Use AudioUnits/VST" are all checked and hit Rescan.
Windows users will only have the option "VST Plugin Custom Folder", manually navigate to the location you installed your KORG plugins.