OM brand colors for Kate and KWrite
Make sure you don't have any other theme in your download folder to confuse you when doing this one.
Open OMDark.theme
Click the Download Raw File button in the Top-Right or use Ctl+Shft+s to download to your PC.
Open Kate > Settings > Configure Kate
Go to Color Themes > Theme Editor > Import
Once imported, click Apply
OMDark should now show as a choice in the pull down menu for Kate and KWrite.