I have SketchUp Make 2016. I have downloaded and installed OpenStudio on the machine. However, OpenStudio cannot be added to SketchUp. I have tried everything including Preference/Extension/installation..... looking for .rbz file… Extension Warehouse...etc but cannot find a way. On my SketchUp toolbar, there is no "Plug-in" or "Extension" icon. Please let me know how to proceed.