Start by searching for NVIDIA Geforce Experience  in your Windows search bar.

Open up GeForce Experience and select the Drivers tab on the top left.

Select Check for Updates in the top right corner of the screen.
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Any available updates will appear on screen.

Click "Download" to start installing the available updates.

Your downloads will start. A status bar will appear to show you when the download is complete as well as allowing you to stop or pause the download if you need to. 

Once all downloads are complete you can exit GeForce Experience.