Use Connect IQ (the Garmin app store) to put the Strava Routes app on your Garmin. Every route you have starred on Strava will pop up in the app available to download.
I couldn't get the Strava app to work, but did find a work around:
Fyi you can avoid using a computer if you download the gpx file on your phone and open it with the Garmin Connect app
@user20714 started
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Use Connect IQ (the Garmin app store) to put the Strava Routes app on your Garmin. Every route you have starred on Strava will pop up in the app available to download.