the download is automated, if you have it will be found:
Android:
For Android, Google rolled this out as part of an update to the Google app pushed via the Google Play Store, as opposed to users having to wait -- potentially forever -- for an Android update.
For Android, go Settings > Google and click on COVID-19 exposure notifications, where you'll get all the details.
Apple
Apple rolled out the feature as part of its iOS 13.5 update for the iPhone. You can find it by going Settings > Privacy > Health under COVID-19 Exposure Logging. There it explains that an authorized app is required to turn the feature on.
Android:
For Android, Google rolled this out as part of an update to the Google app pushed via the Google Play Store, as opposed to users having to wait -- potentially forever -- for an Android update.
For Android, go Settings > Google and click on COVID-19 exposure notifications, where you'll get all the details.
Apple
Apple rolled out the feature as part of its iOS 13.5 update for the iPhone. You can find it by going Settings > Privacy > Health under COVID-19 Exposure Logging. There it explains that an authorized app is required to turn the feature on.