Installation Instructions - Majiir/Kethane GitHub Wiki
Installation steps for Kethane are the same as for most other plugins. These instructions are here for completeness.
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Download the latest version of Kethane from the link given in the forum thread.
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Extract the contents of the download archive to your Kerbal Space Program folder. Allow merging folders when prompted.
A clean installation (where previous Kethane installations are removed first) is always recommended.