Window (menu) > Preferences (dialog) > Extensions (panel) (It usually goes into your user “Downloads” folder accessible from your “Libraries” group in Explorer.) You download a ZIP or RBZ (which is just a renamed ZIP archive,) in the normal way.
It can automatically install and later uninstall or update extensions.
You’ll just need to sign in from inside SketchUp, when the Extension Warehouse WebDialog opens. Since you have created an account here, you have an account there as well. The Trimble SketchUp Extension Warehouse is integrated with SketchUp. At the bottom, in the “Privilege Level” group, check “Run this program as an administrator.” Right click the program shortcut(s) and choose “Properties”. SketchUp should itself be run “As Administrator”. You right-click the installer, and “Run as administrator.” SketchUp (and most all applications,) need to be installed by running installers with elevated privileges.
