Conversion Pro Plus

Keep getting 500 | Server Error !!!! The app does exactly what we were looking for - reserving items for a short amount of time. Our customers love this feature and it's mostly been a great addition. However, we keep getting 500 | Server Error when trying to launch the app which means I cannot edit any settings and our website has not had the proper function for over a week!!! It also means we cannot access any help chats to contact customer service. Not sure why we'd continue paying if the app isn't in service.... please fix!