You may not have the option to add an app to your Wishlist for the following reasons: · The permission to add a particular app to your Wishlist can sometimes be blocked by the developer of the app. · In some cases, to keep your device or computer safe, Google Play’s app verification feature will block apps created by 3rd party developers, disabling the option to download the app. If you’re experiencing problems adding other items to your Wishlist, the Google Support Team is available to help troubleshoot.