Syncfusion just release new version that support Visual Studio 2017 (https://www.syncfusion.com/forums/127486/essential-studio-2016-volume-4-release-v14-4-0-15-is-available-for-download)

Direct link for download is here or if you already have community license, just login to your portal and download from there.

For Offline documentation for VS 2010/2012/2013/2015/2017 can download here and for VS 2005/2008 can download here