RichTextBox Problem

I'm having trouble with the RichTextBox. This is the error I'm getting.
File or assembly name RichTextBox, or one of its dependencies, was not found.
<%@ Register TagPrefix="rtb" Namespace="RichTextBoxControl" Assembly="RichTextBox, Version=3.1.0.0, Culture=neutral, PublicKeyToken=17b15412cfbf13c1" %>

Here's what I did:
Iinstalledthe evaluation version of RichTextBox.
Added itto the GAC.
Created a new asp.net project.
Added a reference to the RichTextBox assembly and I set "Copy Local" to false.
Added the RichTextBox control to a web form.
It works fine on my PC.
I uploaded the project to the discountasp.net server and I get the error above when I run it.

I'm assuming that the problem is that my version is 3.1 and that version is not installed on the discountasp.net server. How can I make it look for the 2.5 version? I changed the "Version" in the "@ Register" directive statement to 2.5.0.0. I also tried adding the assembly to the web.config file with a 2.5.0.0 version. I get the same error in both cases and the messageshows the version as 3.1.0.0. I contacted Richer Components to see if they can give me a 2.5 eval version but I haven't heard back from them.

Thanks,
Kevin