Hi Peter,
Thanks for using Syncfusion products.
You can install the latest Essential studio version by without uninstalling the older version. Please refer the below help contents for how to migrate the projects to latest Syncfusion version.
http://help.syncfusion.com/ug/common/documents/105howtoupgradethepr.htm
Please find the latest Essential Studio version setup from the below link
http://www.syncfusion.com/downloads/latest-version
Please let us know, if you have any queries.
Regards,
Sivaguru S