Adding a Reference on a pwd protected macro

hi-
I have distributed a macro to some people in another location. I password protected this macro so no one can see or alter the code. The macro worked fine for a while but now it doesn't. It gets the following error message, "compile error in hidden module: Converter".
I think they need to turn on a Reference...(Microsoft Forms 2.0 Object Library) I told them to do this but they can't seem to add this reference because the macro is protected. Help!!!