You can download and install Fologram for HoloLens from the Windows store either by deploying to your device from your desktop or directly from the Store on the HoloLens.
On the Hololens:
Ensure your Hololens is running the most up to date operating system. You can check this via the Settings Menu
From the home screen, open the Windows Store and ensure you are logged in with your account.
Search for Fologram and click on 'Get' to download Fologram.