After setting up your Microsoft HoloLens 2 device, you’ll need to launch the Microsoft Store app on your HoloLens and search for “SketchUp” to locate and install the SketchUp Viewer app.
SketchUp Viewer is free to install but when you launch the app, you’ll be required to Sign In with your Trimble account, so you’ll need to create one, if you haven’t already. You can read more about creating and using Trimble Accounts here.
The next step is to enable voice commands, which is optional. In order to enable voice commands, you’ll need to grant SketchUp Viewer the ability to access your device’s microphone. More information is available in the article about Voice Commands.
After signing in, you are able to freely explore the demo files that are included with the app. In order to open and work with your own models, you will need to have an active SketchUp Pro or SketchUp Studio bundle subscription. Alternatively, if you’d simply like to try out the application, you can initiate a free, 30-day trial of SketchUp Studio, which includes trial access to the SketchUp Viewer for HoloLens app. More info about subscription bundles and pricing can be found here.
The AR/VR Extension for SketchUp, allows you to publish the models you’re working on in SketchUp directly to any AR|VR devices on your network that are running the SketchUp Viewer app. The extension isn’t required but will surely enhance the experience of viewing your models with your HoloLens. See Using the AR|VR Extension for details.
For an introduction to SketchUp extensions, see Getting Started in the Extension Warehouse. For details about installing an extension, see Adding Extensions to SketchUp.