When you go to Older Versions (the second link above the big Download button) you should see a list with the versions you have available.
Find 2012.2 607 (Jun 11, 2012) and click it.
You should then see a list with various files from that release - automated installation and manual installation should be the first two. These are the "regular" controls.
You should scroll down and under the SharePoint 2010 section find the RadEditor for MOSS 2007 zip.
I am attaching a screenshot of what you should be seeing as a reference.
If you still cannot locate it, please open a support ticket, where we can investigate any potential licensing issues that may be preventing you from accessing it.
Consider using RadControls for ASP.NET AJAX (built on top of the ASP.NET AJAX framework) as a replacement for the Telerik ASP.NET Classic controls, See the product support lifecycle here.