An update from OverDrive regarding the OverDrive App:
Effective today, the legacy OverDrive app is no longer available to download from the Apple App Store, Google Play, or the Microsoft store*. Users who have the OverDrive app (mobile or desktop) installed will still be able to use it without disruption. All users can continue to access your library’s OverDrive website.
*Please note it may take several hours for this change to be reflected in all app stores.