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Installing Sitecore 9: Install the Sitecore Installation Framework Module - MarkvanAalst.com
To install the Sitecore Experience Platform you need the Sitecore Installation framework first. You can download SIF from the Sitecore developer site at https://dev.sitecore.net but it is also available on the Sitecore gallery, a public MyGet feed where you can download Sitecore PowerShell modules. Registering the Repository First you will need to register the repository