Newest update: Jan 16, 2019
RubyMine 2018.3.3 puts Darcula 2018.2 back in the list of color schemes (Preferences / Settings | Editor | Color Scheme) and doesn't require any importing. Please update to the newest version from the IDE, via Toolbox App, or download it from our website.
Previous update: Jan 6, 2019
Download the Darcula_2018.2.icls file from here.
In RubyMine, go to Preferences / Settings | Editor | Color schemes. Click on the gear icon and choose "Import Scheme".
Find and choose the earlier downloaded Darcula_2018.2.icls. Don’t forget to click “Apply” after im