You have to find a way to load an assembly from a network location, by default is is prohibited by the system. This is not MicroStation specific, MicroSoft prevents you from loading a .dll from any UNC. There should be an number of articles dealing with this (MSDN or google for assembly+network). I expect there is a group policy (security policy eventually from AD) to handle that. If you want to provide your solution to any customer, a local installation is suggested anyhow.
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