Using IntelliJ Ultimate 2018.1 with updated Python plugin.
Didn't import any Python related stuff from previous version.
There's no possibility to add a Python SDK:
Clicking on the icon for 'Project Structure', then choosing 'Platform Settings -> SDKs', the clicking the 'plus sign', then clicking the popping-up 'Add...' box (there's no 'Add local...' or anything else)... nothing happens.
IDE log is here: https://pastebin.com/bCnWFgg2