You can find the download under your Telerik account in the Manage Products -> Trial Downloads section. Here is a link for ease - http://www.telerik.com/account/your-products/trial-product-versions/trial-single-download.aspx?pmvid=2760&pid=561
. You can download either automatic msi installation package or manual wsp package. Here is a link to our online documentation regarding the Sharepoint web parts deployment - http://www.telerik.com/help/aspnet-ajax/moss-installing_radeditor__radgrid_web_parts_on_sharepoint_2010.html
I hope the information provided helps.
the Telerik team
Learn how the Telerik controls can be integrated in SharePoint 2007/2010 from this resource
. To watch them in action, explore our online SharePoint 2010