Download crosswort from the App Store and tap "Get Started." You can sign up with your Apple ID, Google account, or email address.
Go to your profile settings and tap "Language." You can switch your target language at any time. Your progress for each language is saved separately.
Crosswort uses spaced repetition to select vocabulary for your puzzles. Words you've struggled with appear more frequently, while words you know well show up less often. Each puzzle is personalized to help you learn efficiently.
Sign in with the same account you used when you originally subscribed. Your subscription is tied to your Apple ID and should restore automatically. If it doesn't, go to Settings and tap "Restore Purchases."