Use "Report an error" on the question card, or email us with the question ID (shown at the bottom of every question). Verified fixes ship in the next bank update — usually within days, and you don't need to update the app to receive them.
Tap Settings → Restore Purchases on any device signed into the App Store account that bought the Full Kit. Refunds are handled by Apple via reportaproblem.apple.com.
Email support@part107prep.online — a real person answers.