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Office will only load managed code assemblies which are fully trusted by the .Net CAS policy. When developing a VSTO solution, Visual Studio tweaks the CAS policy to allow Office to load the VSTO assemblies from a default <projectname>_bin folder under the solution folder. Attempting to run the VSTO from any other ___location (local or remote) will fail due to lack of permissions.
If you need to enable the VSTO assembly to run from a different ___location such as a remote or virtual directory, the easiest solution is to modify the policy to trust the remote URL:
C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\caspol -q -m -ag 1 -url VSTO_ASSEMBLY_URL/* FullTrust -n VSTO_ASSEMBLY_NAME
The above command assigns *full trust* to any assembly in the specified directory. While this configuration provides the greatest ease-of-use while developing, it is *not* a secure solution. Never do this anywhere other than your development environment! For deployment, the policy modifications should be much narrower, for example assigning permissions based on strong name or publisher.