ARToolKit for Unity on Windows
From ARToolworks support library
Main Page > ARToolKit for Unity > ARToolKit for Unity on Windows
Requirements
To use the plugin in Windows, you must have the ARToolKit4 binary distribution somewhere on your system path, as Unity must be able to locate the ARToolKit DLLs in order for the plugin to load and run.
The easiest solution is to add the ARToolKit bin directory to your environment path variable.
Bear in mind that if you generate a standalone executable for distribution, then you will have to include the necessary ARToolKit DLLs along with your application, or have your end-users install the ARToolKit binary distribution also.
