They are running this promotion again and thought someone might look for this again. I had problems finding how to get the free 1-year trial of their "plus" service which is normally $10/mo. I found that every time I clicked on upgrade, it immediately wanted to charge my credit card, both in the app and on the web. However, I eventually figured out that once you have signed up for the free account, and you have installed the app, go to "settings" and there is a spot to enter a discount code before clicking the upgrade button. Then it immediately is upgraded without asking for payment.