Step One: Head to my.runhunters.app
Step Two: Search for your run, once found, click on the three dots ... and select download

For importing via Movescount
Step Three: Head to movescount.com and in the top right under your profile picture select watches
Step Four: A new screen will appear, scroll down to Navigation and click: Routes and then create new route
Step Five: A map screen will load, in the bottom left you will click the + symbol and select Import Route.
Step Six: Select the run you would like to load and once loaded, name, select us with my Suunto .... and then save.
Step Seven: Connect your watch to your computer to load the run into your watch and you're ready to explore.

For importing a GPX file into the Suunto app for IOS instructions are here

For importing a GPX file into the Suunto app for Android instructions are here