Send an email and include as much detail as possible (device model, iOS version, app version, and screenshots when relevant).
Some obscuring methods are tied to Plus or Pro. You can still preview them before deciding to unlock.
No. Plate detection and obscuring run on-device in the app.
Open PlateShield settings and use the restore purchases action.
Saved images go back into your Photos library and are grouped into the PlateShield album.