Using addins compiled against 2.4.2.0 on 2.4.5.0

So I went against recommendations and made an addin that references
nunit.core (2.4.2.0).

When I drop it in NUnit 2.4.5's bin/addins directory, it doesn't show
up at all in the addins window.

I tracked it down to AddinManager.Register().
assembly.GetExportedTypes() is throwing FileLoadException because it's
looking for nunit.core 2.4.2.0.

I made a .config file for the addin's assembly:
<configuration>
 <runtime>
   <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
     <dependentAssembly>
       <assemblyIdentity name="nunit.core"
publicKeyToken="96d09a1eb7f44a77" culture="neutral"/>
       <bindingRedirect oldVersion="2.4.2.0" newVersion="2.4.5.0"/>
     </dependentAssembly>
   </assemblyBinding>
 </runtime>
</configuration>

but it's either being ignored or I have it in the wrong place (right
next to the addin assembly in bin/addins).

Of course rebuilding the addin with a reference to the new nunit.core
fixes the problem, but I'd like to fix it without doing a rebuild.

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