@Dougmcpeek1 When you download any license file you save it onto your computer, put it in a sensible location [like a subfolder in Documents] You do not 'open' it. Once it's on your computer you then need to validate it within SketchUp, under the Tools submenus for that extension. Extension RBZ files can be downloaded from our PluginStore and then installed using the Extensions > Extension Manager dialog's 'install' button. Save it onto your computer, do not try to open it - the install it. You will need to have the latestest SketchUcation toolset installed for the licensing, and additionally it also provides tools like Extensionstore³, which allow you to auto-install selected extensions from a dialog, sidestepping the RBZ download completely, and reminders for available updates, etc. With Fredo6's extensions you will also need his latest LibFredo6 installing - which is a library of helpers. After these installations restart SketchUp to sync everything. Then do the licensing.