Uncompress the downloaded .rar file in your favourite Sample Libraries folder. Kontakt patches are stored inCore Instruments and Core Variations folders. Please, remember to keep both files and folder structures or Kontakt will pop-up an error message asking for missing files. In that case, all samples are stored into Samples folder.
Uncompress the downloaded .rar file and run first the plugin installer, then the content installer. If you want to move the sample content, please check the Settings section of the user manual. Read the PDF here