Here's the smilem dark theme updated to be compatible with recent Arduino IDE versions: https://github.com/per1234/ino-themes/archive/themeDark-smilem.zip.
I did make a few changes because I found the poor contrast between some of the original color settings made it very difficult to use.
I don't actually use this theme so please let me know if you find any issues or improvements at GitHub - per1234/ino-themes: Arduino IDE themes. There are some new graphics files(*.svg and *@2x.png) that were not included with the original themes but it seems to work OK without them.
I'll have the Jerware theme converted soon.