All add-ons from Rikoooo can be uninstalled the same way :
This works on Windows Vista, 7, 8 and 10.
On the desktop, click on the « Start Menu », then on « All Programs » and go to the « Rikoooo Add-ons » folder. When you click on it, you’ll find the list of add-ons you’ve installed on your computer. Now, you just have to choose the one you want to uninstall.
Other method, from the Control Panel of Windows choose Programs and Features now you see the list of all your installed programs, select the one you want to uninstall.