Hi James,
Thank you for your interest in syncfusion Products.
MultiSuggestExtended and MultiSuggest features are implemented in our Essential studio 6.3.0.30 version and further release. Which you can refer to the below location for download.
Latest version:
http://www.syncfusion.com/downloads/latestversion/default.aspxPlease let me know if this helps you.
Regards,
Hema