If you are a git user, you can install the theme by cloning the repo:
$ git clone https://github.com/getomni/kde-plasma.git
Download using the GitHub .zip download option and unzip them.
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Copy
Omni.colors
to~/.local/share/color-schemes
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Go to System Settings > Plasma Style
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Select the Breeze plasma style
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Go to System Settings > Application Style
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Select the Breeze application style
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(Optional) Go to System Settings > Application Style > Window Decorations
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(Optional) Select the Breeze window decorations
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Go to System Settings > Colors
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Select the Omni color scheme