You can manage your billing and cancel your subscription at any time by logging in to your account. Billing is managed with our payment provider FastSpring, and when you log into your account click "Manage on FastSpring" to go to the FastSpring billing portal. When you cancel your subscription, you'll still receive updates until the end of your billing period. For example if you purchase Gust in June 2020 and cancel in July 2020, you would still receive updates until June 2021.
As always, if you run into any issues please contact us at support@getgust.com.