I paid for add-in X, after I updated the app it doesn't show up

If you've previously purchased an add-in, but it got deactivated after an update, it's likely the cached information about your purchase was lost. The Marketplace still has a record of it though, so all you need to do is hit the Buy button on Cyclometer for the add-in you're trying to restore. You should be taken to a Marketplace page which'll tell you that you already own this product. There'll be an Install button on that page; hit that, and the add-in should be restored.

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