Migration of most COM-based plugins to a new install of STK requires recompilation and re-registration with STK and the windows registry before its use.
Plugins that are built with a compiler, such as C++ or .NET plugins, cannot be used with mulitple versions of STK at a time. They must be recompiled/registered for each version of STK in which they are to be used. The COM DLL references within the compilable plugin project must be updated to use the libraries from the STK installation from which they are to be used.
Windows Script Components can be used by mulitple STK installation versions because they are late bound non-compiled COM-based plugins, and all references are determined by the caller (STK) of the plugin.
Refer to Visual Studio .NET documentation for further details on the Visual Studio .NET project and source code details which are beyond the scope of the migration documentation.
Follow the directions provided below from the version of STK that you are migrating your COM-based plugin from:
Migrate a plugin from STK 8 and STK 7
STK Programming Interface 11.0.1