You can download both the source data and the derived data by state from this FTP site or from this list of map packages in ArcGIS Online. An ArcGIS Online account is not required to download the data. If you have an ArcGIS Online account, you may use the Intact Habitat Filter App, found here, to navigate to your community and save filtered intact habitat core data to your account – in other words, with an ArcGIS Online account you can immediately begin to work with this data.