Yes, WikiCamps will need to be re-purchased as you are changing, or adding, an operating system.
Different app stores do not allow cross-platform transfers, such as the Google Play Store, Apple App Store, and the Microsoft Store.
Once downloaded, if you already have a WikiCamps User Account, you can log in with those details to access your previously saved trips and favourites.
WikiCamps. By campers, for campers.
Article relates to Android, Apple, and Windows devices