Why won't it let me start the free trial?

We don't offer a free premium trial now, but we do have a Free Boost Trial. If Hily isn't letting you use the free boost trial, you've probably already used it before. Maybe you had an account in the past, that's why your Store won't let you proceed for free. The free boost trial is a one-time thing, so trying to start it again will get you charged by the Store. You can find more info about this in our  Subscription Terms.