Currently the Telerik controls (trial version) are shipped by default with OpenEdge installer, and there is no way to prevent them from installing. You need to manually uninstall the trial and install the licensed version after installing or upgrading OpenEdge.
We are getting "'Buy Telerik" nag screens because of this, see tech support case 00407911
What would be great is if the Telerik controls would become as easy to install as the Infragistic Controls. What I mean by this is that they should exist as a license code that you could enter a serial number and control code for. If you want an eval, get an eval license for it. If you don't need the product, don't install it. Kills two birds with the one stone.